他补充道：“背包的出现有点改变了午餐盒的使用场景。”

The introduction of backpacks changed the lunch box scene a bit, he adds.

youdao

当然，这只是一个简单的使用场景。

Of course this is just a simple use case.

youdao

下一节讨论几个常见的使用场景。

The next section walks through a couple of common usage scenarios.

youdao

Now, that's a very important point, because why in the world would you give a shield of the kind I am describing, for a man to defend himself, if you imagine him standing by himself anywhere, if you imagine him any distance from the rest of the guys fighting alongside of him.

这点非常关键,那就是到底为什么要将,这样一种盾牌,给士兵们使用,想象一下这个场景,这个士兵在战场的某个角落孤军奋战,与其它友军士兵相隔甚远

耶鲁公开课 - 古希腊历史简介课程节选