Chafee Aegis Destroyer,docked in South Korea as part of an annual joint military drill with the South's forces.

VOA: standard.2009.03.12

If you drill down at the level of molecules you see that it's not homogeneous.

如果你深入到分子层面上,你就会发现它是不均匀的。

麻省理工公开课 - 热力学与动力学课程节选

So, that's the drill. But, again, that's up to you.

这是练习，但是，我告诉你们，这取决于你们。

麻省理工公开课 - 固态化学导论课程节选