太阳辐射可以轻易地通过高空薄云层，就像通过空气一样。

High thin clouds are very transparent to solar radiation, like clear air.

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与前一天获得的图像相比较，阿莱克斯变得更为紧密，在暴风内很少见到有晴空或者薄云层的区域。

Compared to the image acquired the previous day, Alex appears tighter, with fewer areas of clear sky or thin clouds within the body of the storm.

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高而薄的云层有助于升温，而低而厚的云层使地球冷却。

High thin clouds contribute to heating while low thick clouds cool Earth.

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