中英释义：
双语例句
你打电话来时，他们正在打网球。
They were playing tennis when you called.
重点词汇
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他们
they; them; theirs; these; their
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正在
in the process of; in the midst of; at the moment; in course of; in the act of; currently; presently
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打电话
phone; ring up; make a telephone call; call