As you might imagine, a userid by itself is not necessarily unique, for instance, within the entire Internet, there are probably a number of people lucky enough to have a spiffy userid like garret.

• 正如你可以想像的那样，一个用户标识符本身并不必然是惟一的。例如，在整个因特网内，可能会有不少人很幸运地具有一个像garret那样好看的用户标识符。