Now comes a study finding that it’s possible to increase the brain’s gray matter quite quickly—in only a matter of days.
现在，一项最新的研究发现，不需要这么久，大脑增加灰质的速度更快——是以“天”计算的。
He quickly dresses in a black habit, the traditional garb of Orthodox monks, runs his fingers through his long gray beard, and hurries off to a church for morning prayers.
他迅速地穿上那件传统的东正教的修道士服，用手指梳理完他那长长的灰色胡须，便急忙走向教堂去做早祷。
How did the world grow so gray, so quickly?
世界怎么会以如此快的速度变得如此衰老？
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