The keywords should be the first field of each non-comment line; the string quotes that you typically associate with a char* are optional here.

关键字应该是每一个非注释行的第一个字段；通常与 char* 相关联的字符串引号是可选内容。

youdao

So if I want to use a string as we'll call it which is a word or phrase generally, they always go between double quotes, David hence the quotes around David, and they are double quotes not single quotes intentionally.

当我们要表示单词啊，词组啊，句子啊等等这样的东西时,就会用到字符串，它们位于双引号之间，也就是这里双引号之间的，是双引号，不是单引号哦。

哈佛公开课 - 计算机科学课程节选

other people had solved that problem for me, and this thing between quotes, we'll start calling a string.

至于如何实现的别人已经解决了，这个在引号之间的东西叫字符串。

哈佛公开课 - 计算机科学课程节选

And you might say, wait a minute, isn't that a string, and the answer's no, I didn't say it's a string by putting quotes around it And notice how the machine responds differently to it.

你会想，等等，这不是个字符串么？,答案是否定的，我没用引号包围它就意味着它不是字符串,请注意计算机对它给出了不同的反应。

麻省理工公开课 - 计算机科学及编程导论课程节选