  </symbol>
  <symbol overflow="visible" id="glyph1-4">
  <path style="stroke:none;" d="M 6.34375 -5.046875 L 0.671875 -5.046875 L 0.671875 -6.03125 L 6.34375 -6.03125 Z M 6.34375 -2.4375 L 0.671875 -2.4375 L 0.671875 -3.421875 L 6.34375 -3.421875 Z M 6.34375 -2.4375 "/>
  </symbol>
  <symbol overflow="visible" id="glyph1-5">
  <path style="stroke:none;" d=""/>
  </symbol>
  </g>
  </defs>
  <g id="surface1">
 
</s> remove <symbol overflow="visible" id="glyph1-4">
 </s> add <symbol overflow="visible" id="glyph2-0">
<path style="stroke:none;" d="M 1.5 0 L 1.5 -7.5 L 7.5 -7.5 L 7.5 0 Z M 1.6875 -0.1875 L 7.3125 -0.1875 L 7.3125 -7.3125 L 1.6875 -7.3125 Z M 1.6875 -0.1875 "/>
</symbol>
<symbol overflow="visible" id="glyph2-1"> </s> remove <path style="stroke:none;" d="M 6.5625 -8.59375 L 7.703125 -8.59375 L 7.703125 -3.625 C 7.703125 -2.757812 7.601562 -2.070312 7.40625 -1.5625 C 7.207031 -1.0625 6.851562 -0.648438 6.34375 -0.328125 C 5.832031 -0.015625 5.164062 0.140625 4.34375 0.140625 C 3.539062 0.140625 2.878906 0.00390625 2.359375 -0.265625 C 1.847656 -0.546875 1.484375 -0.945312 1.265625 -1.46875 C 1.046875 -2 0.9375 -2.71875 0.9375 -3.625 L 0.9375 -8.59375 L 2.078125 -8.59375 L 2.078125 -3.640625 C 2.078125 -2.890625 2.144531 -2.335938 2.28125 -1.984375 C 2.425781 -1.628906 2.664062 -1.351562 3 -1.15625 C 3.34375 -0.96875 3.757812 -0.875 4.25 -0.875 C 5.082031 -0.875 5.675781 -1.0625 6.03125 -1.4375 C 6.382812 -1.820312 6.5625 -2.554688 6.5625 -3.640625 Z M 6.5625 -8.59375 "/>
 </s> add <path style="stroke:none;" d="M 7.21875 -5.046875 C 8.453125 -5.375 9.78125 -5.875 11.15625 -6.5625 L 10.640625 -7.265625 C 9.53125 -6.65625 8.390625 -6.1875 7.21875 -5.859375 L 7.21875 -9.65625 L 6.34375 -9.65625 L 6.34375 -0.34375 C 6.34375 0.453125 6.71875 0.859375 7.484375 0.859375 L 9.75 0.859375 C 10.1875 0.859375 10.53125 0.71875 10.765625 0.484375 C 11.015625 0.1875 11.203125 -0.65625 11.296875 -2.046875 L 10.46875 -2.3125 C 10.421875 -1.09375 10.296875 -0.390625 10.109375 -0.1875 C 9.953125 -0.03125 9.765625 0.03125 9.546875 0.03125 L 7.734375 0.03125 C 7.375 0.03125 7.21875 -0.140625 7.21875 -0.484375 Z M 1.46875 1.015625 C 2.96875 0.6875 4.40625 0.3125 5.71875 -0.109375 L 5.5 -0.921875 C 4.453125 -0.578125 3.40625 -0.28125 2.359375 -0.03125 L 2.359375 -5.40625 L 5.4375 -5.40625 L 5.4375 -6.25 L 2.359375 -6.25 L 2.359375 -9.59375 L 1.484375 -9.59375 L 1.484375 -0.296875 C 1.484375 -0.078125 1.390625 0.09375 1.203125 0.21875 Z M 1.46875 1.015625 "/> </s> remove <path style="stroke:none;" d="M 0.40625 -3.109375 C 0.40625 -4.265625 0.722656 -5.117188 1.359375 -5.671875 C 1.890625 -6.128906 2.539062 -6.359375 3.3125 -6.359375 C 4.164062 -6.359375 4.863281 -6.078125 5.40625 -5.515625 C 5.957031 -4.960938 6.234375 -4.191406 6.234375 -3.203125 C 6.234375 -2.398438 6.113281 -1.769531 5.875 -1.3125 C 5.632812 -0.851562 5.28125 -0.492188 4.8125 -0.234375 C 4.351562 0.015625 3.851562 0.140625 3.3125 0.140625 C 2.445312 0.140625 1.742188 -0.132812 1.203125 -0.6875 C 0.671875 -1.25 0.40625 -2.054688 0.40625 -3.109375 Z M 1.484375 -3.109375 C 1.484375 -2.316406 1.65625 -1.722656 2 -1.328125 C 2.351562 -0.929688 2.789062 -0.734375 3.3125 -0.734375 C 3.84375 -0.734375 4.28125 -0.929688 4.625 -1.328125 C 4.96875 -1.722656 5.140625 -2.328125 5.140625 -3.140625 C 5.140625 -3.910156 4.960938 -4.492188 4.609375 -4.890625 C 4.265625 -5.285156 3.832031 -5.484375 3.3125 -5.484375 C 2.789062 -5.484375 2.351562 -5.285156 2 -4.890625 C 1.65625 -4.503906 1.484375 -3.910156 1.484375 -3.109375 Z M 1.484375 -3.109375 "/>
 </s> add <path style="stroke:none;" d="M 3.640625 -9.9375 L 2.84375 -9.546875 C 3.25 -8.96875 3.640625 -8.3125 4 -7.578125 L 4.78125 -7.953125 C 4.421875 -8.671875 4.03125 -9.34375 3.640625 -9.9375 Z M 7.640625 -6.703125 L 7.640625 -3.890625 L 4.453125 -3.890625 C 4.515625 -4.390625 4.546875 -4.9375 4.5625 -5.546875 L 4.5625 -6.703125 Z M 7.640625 -3.0625 L 7.640625 1.140625 L 8.53125 1.140625 L 8.53125 -3.0625 L 11.359375 -3.0625 L 11.359375 -3.890625 L 8.53125 -3.890625 L 8.53125 -6.703125 L 10.890625 -6.703125 L 10.890625 -7.53125 L 8.203125 -7.53125 C 8.609375 -8.140625 8.96875 -8.828125 9.3125 -9.59375 L 8.390625 -9.9375 C 8.046875 -9.078125 7.671875 -8.28125 7.21875 -7.53125 L 1.15625 -7.53125 L 1.15625 -6.703125 L 3.6875 -6.703125 L 3.6875 -5.546875 C 3.671875 -4.953125 3.640625 -4.40625 3.5625 -3.890625 L 0.65625 -3.890625 L 0.65625 -3.0625 L 3.4375 -3.0625 C 3.34375 -2.59375 3.203125 -2.171875 3.046875 -1.78125 C 2.609375 -0.859375 1.84375 -0.109375 0.765625 0.4375 L 1.265625 1.234375 C 2.40625 0.671875 3.234375 -0.125 3.734375 -1.140625 C 3.984375 -1.6875 4.1875 -2.3125 4.328125 -3.0625 Z M 7.640625 -3.0625 "/> </s> remove <symbol overflow="visible" id="glyph0-26">
<path style="stroke:none;" d="M 5.296875 -2.265625 L 6.140625 -2.046875 C 5.960938 -1.347656 5.640625 -0.8125 5.171875 -0.4375 C 4.710938 -0.0703125 4.144531 0.109375 3.46875 0.109375 C 2.78125 0.109375 2.21875 -0.03125 1.78125 -0.3125 C 1.34375 -0.59375 1.007812 -1 0.78125 -1.53125 C 0.5625 -2.070312 0.453125 -2.648438 0.453125 -3.265625 C 0.453125 -3.941406 0.578125 -4.53125 0.828125 -5.03125 C 1.085938 -5.53125 1.453125 -5.90625 1.921875 -6.15625 C 2.398438 -6.414062 2.921875 -6.546875 3.484375 -6.546875 C 4.128906 -6.546875 4.671875 -6.378906 5.109375 -6.046875 C 5.554688 -5.722656 5.863281 -5.265625 6.03125 -4.671875 L 5.1875 -4.484375 C 5.039062 -4.953125 4.828125 -5.289062 4.546875 -5.5 C 4.265625 -5.71875 3.90625 -5.828125 3.46875 -5.828125 C 2.976562 -5.828125 2.566406 -5.707031 2.234375 -5.46875 C 1.898438 -5.226562 1.664062 -4.90625 1.53125 -4.5 C 1.394531 -4.101562 1.328125 -3.695312 1.328125 -3.28125 C 1.328125 -2.726562 1.40625 -2.242188 1.5625 -1.828125 C 1.726562 -1.421875 1.976562 -1.117188 2.3125 -0.921875 C 2.644531 -0.722656 3.007812 -0.625 3.40625 -0.625 C 3.882812 -0.625 4.285156 -0.757812 4.609375 -1.03125 C 4.941406 -1.3125 5.171875 -1.722656 5.296875 -2.265625 Z M 5.296875 -2.265625 "/>
 </s> add <symbol overflow="visible" id="glyph1-9">
<path style="stroke:none;" d="M 2.359375 -7.234375 L 1.78125 -7.03125 C 2.046875 -6.671875 2.296875 -6.25 2.53125 -5.78125 L 3.078125 -6.03125 C 2.875 -6.453125 2.640625 -6.84375 2.359375 -7.234375 Z M 6.78125 -7.234375 C 6.5625 -6.78125 6.296875 -6.390625 5.953125 -6.0625 L 6.46875 -5.765625 C 6.828125 -6.125 7.125 -6.546875 7.359375 -7.015625 Z M 1.15625 -5.71875 L 1.15625 -5.125 L 3.765625 -5.125 C 3.625 -4.8125 3.4375 -4.5 3.234375 -4.21875 L 0.640625 -4.21875 L 0.640625 -3.625 L 2.78125 -3.625 C 2.15625 -2.921875 1.359375 -2.34375 0.390625 -1.921875 L 0.75 -1.359375 C 1.34375 -1.640625 1.890625 -1.984375 2.375 -2.375 L 2.375 0.078125 C 2.375 0.546875 2.640625 0.78125 3.1875 0.78125 L 6.515625 0.78125 C 7 0.78125 7.3125 0.703125 7.5 0.578125 C 7.6875 0.40625 7.8125 -0.03125 7.890625 -0.734375 L 7.25 -0.9375 C 7.203125 -0.484375 7.125 -0.1875 7.03125 -0.015625 C 6.953125 0.109375 6.71875 0.1875 6.34375 0.1875 L 3.453125 0.1875 C 3.171875 0.1875 3.03125 0.078125 3.03125 -0.125 L 3.03125 -2.15625 L 5.921875 -2.15625 L 5.921875 -1.484375 C 5.921875 -1.296875 5.796875 -1.203125 5.5625 -1.203125 C 5.1875 -1.203125 4.78125 -1.21875 4.328125 -1.234375 L 4.46875 -0.671875 C 4.90625 -0.65625 5.34375 -0.640625 5.8125 -0.640625 C 6.296875 -0.671875 6.546875 -0.890625 6.5625 -1.3125 L 6.5625 -2.53125 C 7.015625 -2.15625 7.5625 -1.796875 8.203125 -1.453125 L 8.625 -1.984375 C 7.53125 -2.46875 6.71875 -3 6.234375 -3.625 L 8.359375 -3.625 L 8.359375 -4.21875 L 3.984375 -4.21875 C 4.15625 -4.5 4.296875 -4.8125 4.453125 -5.125 L 7.859375 -5.125 L 7.859375 -5.71875 L 4.671875 -5.71875 C 4.828125 -6.203125 4.96875 -6.734375 5.0625 -7.296875 L 4.421875 -7.375 C 4.328125 -6.78125 4.1875 -6.234375 4.015625 -5.71875 Z M 3.578125 -3.625 L 5.578125 -3.625 C 5.78125 -3.3125 6.03125 -3.015625 6.34375 -2.734375 L 2.78125 -2.734375 C 3.0625 -3 3.328125 -3.296875 3.578125 -3.625 Z M 3.578125 -3.625 "/>
<symbol overflow="visible" id="glyph2-2">
  </symbol>
  <symbol overflow="visible" id="glyph1-4">
  <path style="stroke:none;" d="M 6.34375 -5.046875 L 0.671875 -5.046875 L 0.671875 -6.03125 L 6.34375 -6.03125 Z M 6.34375 -2.4375 L 0.671875 -2.4375 L 0.671875 -3.421875 L 6.34375 -3.421875 Z M 6.34375 -2.4375 "/>
  </symbol>
<symbol overflow="visible" id="glyph2-2">
  <path style="stroke:none;" d=""/>
  </symbol>
  </g>
  </defs>
  <g id="surface1">
keep keep keep keep replace keep keep keep keep keep
 [Image Translation] Ch13 (#960)

* reuse v1

* translate d2l-en to d2l-zh 
img/iou.svg