Praise is always nice to receive, but criticism can often be so much more useful.
赞美是总令人欣然接受，但批评，往往可以有更多的用处。
But this might not always be useful.
但是此方法并非始终有用。
Search has always been useful, but now it's vital.
搜索引擎一直都有用，但现在，它变得至关重要。
Search has always been useful, but now it's vital.
搜索引擎一直都有用，但现在，它变得至关重要。
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