短语
中文翻译：正在做某事
同义词：
['be doing', 'in the process of']
例句：
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1. They are in the very actof signing the contract.
他们正在签署合同的过程当中。
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2. The teacher is in the very actof explaining the concept.
老师正在解释这个概念的过程中。
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3.We are in the very act of movingto a new city.
我们正在搬家到一个新的城市的过程中。