ozone

The ozone layer protects the Earth by blocking harmful ultraviolet radiation from the sun.

(Chinese) 臭氧层通过阻挡来自太阳的有毒紫外线辐射来保护地球。

Certain chemicals used in old refrigerators were found to be responsible for the hole in the ozone.

(Chinese) 人们发现旧冰箱中使用的某些化学物质是导致臭氧层空洞的原因。