The brave will will sharpen more strong.

勇敢者将意志品质磨砺得更为坚强。

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And that sounds heard during sleep can trigger associations that sharpen memory even more.

而睡眠时听到的声音会触发联想使记忆更加增强。

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And that sounds heard during sleep can trigger associations that sharpen memory even more.

而睡眠时听到的声音会触发联想使记忆更加增强。

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