一个代码列表是一列拥有特定含义的惟一代码值，比如产品描述符、常用术语、国家或城市列表。
A code list is a list of unique code values that have specific meanings, such as product descriptors, frequently used terms, and lists of countries or cities.
如果你深入调查，你就会发现两个任务描述符的列表是不同的，表达了在整个生命周期中执行详述用例方法任务的不同。
If you look closely, you see that these lists are different for each of these two task descriptors, expressing differences in performing the detailing use-case methods throughout the lifecycle.
select调用返回一个文件描述符列表，对于每个文件描述符至少注册了一个事件。
A select call returns a list of file descriptors for which at least one registered event has occurred.
select调用返回一个文件描述符列表，对于每个文件描述符至少注册了一个事件。
A select call returns a list of file descriptors for which at least one registered event has occurred.
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