健康第一，学习第二。

Health is the first, and study is the second.

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我计划这学期选修俄语课程，继续学习第二外语。

I plan to take Russian course this semester to get on with the study of second foreign language.

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在学习第二语言的同时，学生也应该更加重视掌握母语的重要性。

While learning a second language, students should also enhance their awareness of the importance of mastering their mother tongue.

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And that group did much better on the learning task than the control group, because they were put into a positive mood.

第二组,在学习任务上比对照组表现更好，因为他们被置于积极情绪。

哈佛公开课 - 幸福课课程节选

We could choose any two quantities, and, in fact, it turns out that these are going to prove, after we have the second law, not to be the best choice.

我们可以任选两个物理量，其实，在学习了热力学第二定律之后，我们可以证明，这样的选择并不是最好的。

麻省理工公开课 - 热力学与动力学课程节选

Second thing we saw was, we saw that associated with every primitive value was a type.

我们学习到的第二件事情是，和每个基本值对应的,是一个类型。

麻省理工公开课 - 计算机科学及编程导论课程节选