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extensions的英文翻译是什么意思，词典释义与在线翻译：
英英释义
名词 extension:
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a mutually agreed delay in the date set for the completion of a job or payment of a debt
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act of expanding in scope; making more widely available
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the spreading of something (a belief or practice) into new regions
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an educational opportunity provided by colleges and universities to people who are not enrolled as regular students
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act of stretching or straightening out a flexed limb
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a string of characters beginning with a period and followed by one or more letters; the optional second part of a PC computer filename
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the most direct or specific meaning of a word or expression; the class of objects that an expression refers to
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the ability to raise the working leg high in the air
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amount or degree or range to which something extends
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an additional telephone set that is connected to the same telephone line
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an addition to the length of something
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an addition that extends a main building
extensions的用法和样例：
例句
用作名词 (n.)
- 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。
