单词：extensions
n act of expanding in scope; making more widely available
n the spreading of something (a belief or practice) into new regions
n an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
n act of stretching or straightening out a flexed limb
n a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename
n the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
n the ability to raise the working leg high in the air
n amount or degree or range to which something extends
n an additional telephone set that is connected to the same telephone line
n an addition to the length of something
n an addition that extends a main building
extensions的用法和样例：
例句
- Your back exercises should include lat pull-downs and back extensions.背部的练习应包括前曲和后背伸展。
- For your biceps and triceps, perform bicep curls, hammer curls, dips, and tricep extensions.锻炼二头肌和三头肌，练习二头肌弯曲，锤卷曲，下弯和三头肌伸展。
- These temporary hive extensions contain frames of empty comb for the bees to fill with honey.这些临时的蜂箱扩大了能包含为蜜蜂准备的空巢结构去存蜜。
- There are telephone extensions in every office.每间办公室都有电话分机。
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