以上连接代码相当简单。

The above connection code is fairly straightforward.

youdao

所有通用的连接代码都已经转移到父类中了。

All the generic, boilerplate connectivity code has moved into the parent class.

youdao

连接代码隐藏在应用程序中，因此无法被重用。

The connectivity code is buried in the applications, so it can't be reused.

youdao

So that is a flag that tells the compiler that I want to use or link into my own program code that someone else wrote that lives somewhere else on the system whose moniker is CS50.

所以那是一个标记，用来告诉编译器我想使用,或连接我自己的程序代码到一个叫做CS50的系统中的程序,可能其他人在那个系统写了这些程序。

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