They are correct, as the picture suggests, but then I hit that curly brace.

它们是正确的，就像那个图所表示的，然后以那个花括号结束。

哈佛公开课 - 计算机科学课程节选

When I hit that curly brace, swap's role in life is over.

当我以那个花括号结束，swap的角色就结束了。

哈佛公开课 - 计算机科学课程节选

Well, for a thing called main which itself is a function but a function I wrote, a tool I am writing at the moment not like printf which someone else wrote long ago, I have to say where does main start, where does main end, and I do that by using these curly braces.

至于这个名曰main的函数,由我们自己写的函数，也是一个工具,只不过由我们自己编写，而不是像printf那样已经由前人写好了,我们必须要说明main在哪开始，在哪结束，这样我们就要用到大括号了。

哈佛公开课 - 计算机科学课程节选