建立一個更複雜嘅句子 " Investigations " 系列每年少啲重複嘅資料, 而更多嘅內容係設計為吸引學生嘅.
當然,呢個句子嘅複雜版本係 "The '' Investigations'' series has less repetition of material from year to year, and more contexts that are designed to be engaging to students as they make connections between mathematical topics and from mathematical topics to the world around them". (譯.."調查"系列每年重複嘅內容比較少,