通过对感冒与冷空气活动过程的分析，找出了冬半年中的感冒高发期。
It is found that the favorable incidence of common cold in winter.
三四月份的中国北部冷空气活动频繁。它给该地区带来了大风和沙尘暴。
Cold air is frequent in March and April in northern China and it brings gales and sand storms to the areas.
本文对1981年不同月份8次东亚冷空气活动的陆地变性过程进行了分析。
Authers have studied the transformation processes of cold air over land in East Asia for eight cases which occurred in different months of 1981.
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