既然是标识符，这个地址就可能是无效的，就是说如果尝试打开该地址就会返回“404-Resourcenotfound”错误。
Because they are identifiers, the addresses may be invalid — meaning they may return a "404 - Resource not found" error if you try to follow them.
既然是标识符，这个地址就可能是无效的，就是说如果尝试打开该地址就会返回“404-Resourcenotfound”错误。
Because they are identifiers, the addresses may be invalid — meaning they may return a "404 - Resource not found" error if you try to follow them.
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