每日短语讲解 第984期:忙于
2019-03-21来源:和谐英语
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今日短语：
be occupied in (with).
忙于……，正从事于……
例句：
He was occupied in the study of mathematics.
他忙于研究数学。
When we arrived he was occupied in mowing the lawn.
我们抵达时他正在割草。
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