This last cooling effect is caused by a decline in ozone in the stratosphere which prevents it absorbing as much ultraviolet radiation from the sun above.
最后一项变冷效应是由于平流层臭氧减少所致，而臭氧可抑制平流层从太阳吸收紫外线。
Avoid prolonged exposure under sunlight. Loose clothing, suitable hats and UV-absorbing sunglasses can reduce the chance of sunburn by solar ultraviolet radiation.
避免长时间在阳光下曝晒，以免受太阳紫外线晒伤。应穿上松身衣服以及配戴适当帽子和能吸收紫外线的太阳眼镜。
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