中英释义：
双语例句
他们正在野餐，但开始下雨了。
They are having a picnic, but it starts to rain.
他们正在野餐时，天空突然乌云密布。
They were having a picnic when the sky suddenly clouded over.
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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野餐
picnic; have a picnic; go picnicking; cookout