You can never know what you can do until you really give it a try!

在你真正尝试之前，你永远不知道你可以做什么！

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You can never know enough about other people to give them a fair judgment.

你永远不能通过全面了解一个人而给他一个公正的判断。

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You can never know with back injuries, but we don't think it's too serious.

你说不准伤病的事情，但我们觉得不会严重。

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You can never know for certain in these situations, but Sullivan's staredown of Trotta may have been his last action ever as a professional footballer.

WSJ: Last-Second Soccer Magic Lifts Doncaster to Promotion

But, of course, in science you can never know what you don't know, and so painfully, gingerly, and on occasion delightfully, he tried to anticipate his critics and get his idea ready.

NPR: Charles Darwin and the Racing Asparagus

The bottom line: You can never really know anything about love.

CNN: STORY HIGHLIGHTS