天气预报说，下星期有一股寒流要来了。
But the weather forecast said we are going to have a cold spell next week.
霜化了，新的霜又结上了一层，又来了一股寒流。
The frost had gone, and then a new frost had come, a new wave of cold .
她进来时好象一股寒流，冻得那几个跟在她后面的小孩脸色发青。
She seemed to come in like cold weather, and to make the little children blue as they followed her.
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