CFCs are the chief destroyers of the ozone layer.
氯氟烃是破坏氧层
元凶。
CFCs are the chief destroyers of the ozone layer.
氯氟烃是破坏氧层
元凶。
The ozone layer surrounding the earth protects our skin from being hurt by the ultraviolet rays.
环绕地氧层保护着我们
皮肤免受紫外线
伤
。
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