他们有两个选择：要么吃，要么等15分钟，再吃第二个（然后他们可以同时吃两个）。

They were given two choices: they could either eat it or, if they waited fifteen minutes, they'd be given a second one (and then they could eat both) .

youdao

您也可以将自顶向下方法嵌入到第二个自顶向下方法，接着再嵌入到自底向上方法。

You could also embed the top-down approach within the second top-down approach and in turn, the bottom-up approach.

youdao

理论讲第二个好处是，在提供一项新的服务时，不必再新建网络基础设施就可以快捷轻便的让新的服务授之于大众。

The second advantage is that in theory, new services can be added far more quickly and easily, without the need to add any new network infrastructure.

youdao

So, why don't you go ahead and take 10 more seconds on this second clicker question for our intro.

请大家再花十秒钟的时间,来做一下第二个选择题。

麻省理工公开课 - 化学原理课程节选