I don't know if you know how a spark plug works, but for the electrical current to fly into operation in a spark plug, the two points of contact have to be gapped.

我不知道你们是否知道,火花塞是怎样工作的，在电流通入火花塞中使它运转之前，两个接触点之间需要有空隙。

耶鲁公开课 - 文学理论导论课程节选

Because I know this program was saved by default into my current folder, my current directory, so dot slash means run the program called a.out that's right here in my current directory not in, like, a out my applications folder or somewhere else.

程序默认保存在,当前目录下的文件夹，/意味着运行这个名为“a，out“的文件,是我当前目录下的文件，而不是应用程序文件夹或其他别的地方的。

哈佛公开课 - 计算机科学课程节选