这种做法不仅是不现实的，但它很容易失败。
This approach is not only unrealistic, but it is prone to failure.
此函数不是标准dom库的一部分，但它很容易实现。
This function is not part of the standard DOM libraries, but it's easy enough to implement.
它通常是一个惟一标识此浏览器的字符串，但它很容易被篡改。
This is (usually) a string that uniquely identifies the browser, though it can be easily faked.
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