<http://schema.org/description>
"&lt;p&gt;When milling with tiny tools, changing the length-to-diameter ratio can significantly change the cutting parameters it is possible to achieve.&lt;br /&gt;&lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/videos/video-understanding-the-role-of-ld-ratio-in-micromachining>