It's gonna be a pretty stupid demo if that was the smallest, but here we go.

如果这个就是最轻的，那这似乎是个,很无聊的演示，我们继续。

哈佛公开课 - 计算机科学课程节选

They are very light, that is to say, low mass.

很轻，也就是说，质量很小。

麻省理工公开课 - 固态化学导论课程节选

So, here's magnesium. It's very light.

我们回到原题，这是镁，它很轻。

麻省理工公开课 - 固态化学导论课程节选