他开始数，然后更加困惑地数第二遍。

He began counting them and then, with growing perplexity, counted them a second time.

《柯林斯英汉双解大词典》

孩子们很兴奋，没完没了地谈论着第二天的活动。

The children chattered to each other excitedly about the next day's events.

《牛津词典》

我会毫不犹豫地选第二个选项。

I would unhesitatingly choose the latter option.

《柯林斯英汉双解大词典》

They often involve the generation of what are called 'second messenger' molecules which carry the signal further into the cell.

过程中通常会生成一种叫做,第二信使的分子,将信号更深入地传递至细胞内部

耶鲁公开课 - 生物医学工程探索课程节选

So, second ionization energy simply means you've already taken one electron out, now how much energy does it take for you to take a second electron out.

第二电离能简单地说就是,在你已经拿走一个电子以后，再拿走第二个电子,所需要消耗的能量。

麻省理工公开课 - 化学原理课程节选

But it's amazing, that every year you find somebody coming up with a way of going around the second law and somehow convincing people who are very smart that this will work.

但是很令人惊奇，每年你都能发现,有人宣称找到了,绕过第二定律的方法,还不知怎么地就说服了,一些非常聪明的人,让他们以为这个真的管用。

麻省理工公开课 - 热力学与动力学课程节选