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.
他会把种种条件和限制堆砌在一起，尽管这样讲话标志着他的细腻敏锐，但也使他显得优柔寡断、软弱无力。
The piling up of conditions and reservations, though a mark of subtlety, makes him seem vacillating and weak.
控制使我们所有人那么紧密联系起来的国际体系的政策需要有更敏锐的先见之明。
The policies governing the international systems that link us all so closely together need to be more foresighted.
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