Use this method to test if supplied user credentials are valid.
此方法用了判断用户身份是否合法。
We could really cut down on carbon emissions if less food was supplied in the first place.
如果一开始就减少粮食供应,我们就能真正减少碳排放。
If, in fact, no date range entry is supplied or if no date range matches, the default destination is invoked.
事实上,如果没有提供日期范围条目,或者没有匹配的日期范围,则会调用缺省目标。
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