The ozone layer outside the polar regions is projected to recover to pre-1980 levels by 2048, although the annual springtime ozone hole over the Antarctic is not expected to recover until 2073.
尽管每年春季出现在南极洲上空的臭氧空洞预计要到2073年才能恢复，但是极地以外地区的臭氧层预计到2048年就可以恢复到1980年以前的水平。
Thee ozone layer outside the polar regions is projected to recover to pre-1980 levels by 2048, although the annual springtime ozone hole over the Antarctic is not expected to recover until 2073.
尽管每年春季出现在南极洲上空的臭氧空洞预计要到2073年才能恢复，但是极地以外地区的臭氧层预计到2048年就可以恢复到1980年以前的水平。
The ozone layer outside the polar regions is projected to recover to pre-1980 levels by 2048, although the annual springtime ozone hole over the Antarctic is not expected to recover until 2073.
到2048年，极地地区外的臭氧层将恢复到1980年以前的水平，但每年春季出现的南极臭氧层空洞要在2073年才能得到恢复。
Media reports dubbed the annual thinning a hole in the ozone layer .
媒体报道称之为臭氧层年度稀释“空洞”。
The closed ballast layer can raise permafrost table, decrease annual mean ground temperature below the ballast layer, and protect the permafrost effectively.
封闭碎石道碴层可以提升冻土上限，降低多年冻土温度，对下部多年冻土起到很好的保护作用。
The closed ballast layer can raise permafrost table, decrease annual mean ground temperature below the ballast layer, and protect the permafrost effectively.
封闭碎石道碴层可以提升冻土上限，降低多年冻土温度，对下部多年冻土起到很好的保护作用。
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