由原路退回
词型变化:名词复数形式 : back-tracks

back-track的用法和样例:

例句

用作动词(v.)
  1. The police are on the track of the gang.警方正在追踪那帮团伙。
  2. They even keep track of your birthday.他们就连你的生日都追踪着。

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Exercise 1-24: Single-Word Phrases CD 1 Track 35 图片1

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CD 2 Track 23 图片1

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3-Methylcholanthrene
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