如果运气好的话，函数的手册页会列出其可能返回的所有值，以及它们在此特定函数的上下文中所指的含义。
If you're lucky, the function's man page lists all of its possible return values and what they mean in the context of this particular function.
我所指的是其字面含义：即对于我们所服务的民众而言将是致命的。
And I mean that literally: deadly for the people we are here to serve.
根据规范的不同，元数据所指的含义也将不同。
Depending on the discipline, metadata can mean different things.
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