Once is more than enough. How can you do it again?

一之为甚， 其可再乎?

《新英汉大辞典》

Can you do it again?

请再做一遍好吗？

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Exercising with others "can keep you accountable and make it more fun, so you're more likely to do it again," Jackovitz says.

杰克维茨说，跟别人一起锻炼“可以让你约束自己，让锻炼的过程更加有趣，你因此更有可能会再次锻炼”。

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"She said to me, 'You can do it under one condition: That you never cross that line again, '" Armstrong recalled.

NPR: Armstrong Turns Emotional In 2nd Part Of Interview

"That is a valuable thing, because usually when you go back and try to find that sort of thing again, you can't do it, " he says.

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And, if you're feeling really frisky, you can pull a window and snap it into place so that it takes up half the screen -- again, similar to what you can do in Windows 7.

ENGADGET: Chrome OS review (version 19)