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

When we have just a single bond in them molecule, you have all the free rotation you want, you can just spin it around, there's nothing keeping it in place.

当我们在分子力只有一个单键时，你可以随意旋转，你可以让它转起来，没有什么东西能固定住它。

麻省理工公开课 - 化学原理课程节选

The Corinthians are free; they will be violating no law or sacred bond if they say, sorry we really don't feel like doing that.

科林斯人可以自由选择,帮还是不帮,如果他们说对不起,我们不想帮忙,他们没有违反任何法律或某种神圣约束

耶鲁公开课 - 古希腊历史简介课程节选