In the winter the temperature often drops below freezing.
冬天的时候，温度往往会降到冰点以下。
Thee article also said the density of PM2.5 generally peaks in winter and drops during summer.
文章还称PM 2.5浓度的最高值一般在冬季，夏季期间有所下降。
Thee article also said the density of PM2.5 generally peaks in winter and drops during summer.
文章还称PM 2.5浓度的最高值一般在冬季，夏季期间有所下降。
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