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21. 你可能已经注意到，当自己筋疲力尽时，更难集中注意力或记住信息。

    nǐ kě​néng yǐ​jing zhù​yì dào, dāng zì​jǐ jīn​pí​lì​jìn shí, gèng nán jí​zhōng zhù​yì​lì huò jì zhu xìn​xī.

    You've likely noticed how it's harder to concentrate or remember information when you're exhausted.

    Source: CCMatrix