介词短语作状语表时间父母常告诉我们他们过去的艰苦生活。

My parents often tell us about their bitter life in the past.

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这样，在暴风雪期间，有时气温会突然下降，雪会变成冻雨和冰雹。（介词短语作时间状语。）

Thus there are times during a snowstorm when the temperature will suddenly drop and the snow will change to sleet and hail.

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