以上来源于: WordNet
The non-data descriptor is likely to be used to return a callable object.
非数据描述符最常用于返回一个可调用对象。
It cannot respond to a file descriptor immediately when the data becomes ready.
当一个文件描述符上数据准备好时，它无法立即响应。
These events can be things like timers, signals, data ready for reading on a file descriptor, and so on.
这些事件可以是诸如计时器，信号，文件描述符上预备读取的数据，等等。
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