一份新的研究表明，人在睡梦中记得的东西都经过了大脑的精挑细选，使我们的思维更加敏锐、清晰。
The brain cherry-picks what people remember during sleep, resulting in sharper and clearer thinking, a new study suggests.
鲁尼从来就不是那种盘带类型的球员，不过他可以专注于自己那敏锐锋利的第一脚触球以及比对手更好的拿球虎护球能力，也使他变得很有杀伤力。
Rooney will never be this sort of player, but he could work on a sharper first touch and take on opponents more, which would make him more dangerous.
凭借着不屈不挠的毅力、俄罗斯该成为什么的敏锐眼光以及体现俄罗斯母亲之精神的意识，普京使俄罗斯重归世界地图。
With dauntless persistence, a sharp vision of what Russia should become and a sense that he embodied the spirit of Mother Russia, Putin has put his country back on the map.
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