【TOEFL核心词汇】No.31 流走之物
Hints：只听写例句。前面的单词不用听写。http://t1.g.hjfile.cn/listen/201212/201212050345487116298.mp3Water has trouble entering this impervious soil and runoff is very common during rainfalls.水很难进入不可渗透性土壤中，在雨季水土流失很普遍。
——译文来自: fly_fiona
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