We had to cut the length of the book by one third.

【length】我们不得不把书的长度缩短三分之一。

He went into the wood and cut a short length of limb from a young, stout tree.

他走进树林，从一棵粗壮的小树上砍下一小段树枝。

He had cut two grooves the length of the board, and laid the board on blocks, one end a little higher than the other.

他在木板的长度上切了两条凹槽，然后把木板放在木块上， 一端比另一端高一点。

For example, in an email to thousands of school-board members asking them to take a survey, cutting the length from 127 to 49 words almost doubled the response rate (from a paltry 2.7% to 4.8%).

例如，给数千名学校董事会成员写电子邮件并邀请他们参加一项问卷调查，当电子邮件的长度从127个字缩短到49个字时，回复率几乎翻了一番(从微不足道的2.7%增加到4.8%)。