这些气体让阳光自由地进入大气层。

These gases allow sunlight to enter the atmosphere freely.

youdao

1977年，航天飞机原型企业作出了首次自由飞行，在地球的大气层，从747后可能进行得高高的分离。

In 1977, the space shuttle prototype Enterprise made its first free flights, in Earth's atmosphere, after separating from the 747 that carried it aloft.

youdao

当它打破这个化学键，氯原子，一个自由的氯原子下来，和在大气层的上方的臭氧反应，这就是臭氧，在大气上层有臭氧。

When it breaks this bond, that chlorine atom, a free chlorine atom comes down and reacts, this is ozone, with the ozone in the upper atmosphere.

youdao

When it breaks this bond, that chlorine atom, a free chlorine atom comes down and reacts, this is ozone, with the ozone in the upper atmosphere.

当它打破这个化学键，氯原子，一个自由的氯原子下来,和在大气层的上方的臭氧反应，这就是臭氧，在大气上层有臭氧。

麻省理工公开课 - 固态化学导论课程节选