例如，若需要保存一个用户所提交值的列表，以便与新值比较，那么在客户机而不是服务器上存储这些数据会比较经济。

For example, if you need to keep a listing of user-submitted values for comparison with newer values, it is economical to keep the data on the client and not the server.

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选择您想要在其中比较计数器的数据库。

Select the database in which you want to compare counters.

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当您希望指定一个回调对象(例如一个比较器)或存放某个值的数据结构，可以使用下限通配符。

Lower-bounded wildcards show up when you want to specify a callback object, such as a comparator, or a data structure into which you are going to place a value.

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