直射光的透过率随着叶面积系数增大而减小，夏半年大于冬半年。

The transmissivity of summer half year is larger than winter half year.

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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.

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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.

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