I showed you last day what happens when they form and we were able to electrolyze and make fantastic metals like magnesium.

昨天我讲过,当离子液体形成我们就可以使其电解,生成出神奇的金属，比如镁。

麻省理工公开课 - 固态化学导论课程节选

First of all, negative time should not bother anybody; t=0 is when I set the clock, I measured time forward, but yesterday would be t = -1 day, right?

首先,负的时间对我们不存在任何干扰,t=0使我们设定的初始时间,我是用顺序计时,所以昨天就可以记为-1天,对吗

耶鲁公开课 - 基础物理课程节选