We have already seen a moon in Book One.

我们已经在卷一中看到了月亮了。

耶鲁公开课 - 弥尔顿课程节选

Because these things are unpaired, we have already seen how unpaired electrons play a role in the Stern-Gerlach experiment.

因为它们都是未成对的，我们已经发现,在Stern-Gerlach实验中,未成对电子扮演怎样一个角色了。

麻省理工公开课 - 固态化学导论课程节选

If you look at the world of Mycenae once again, we've already seen this, you have a despotism of some kind.

如果你重温一下迈锡尼,我们之前也讲过,你会从某种程度上想到专制

耶鲁公开课 - 古希腊历史简介课程节选