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Circadian rhythms are an example.
昼夜节律就是一个很好的例子。
youdao
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We sleep at night and wake up in the morning because we have circadian rhythms;
我们在晚上睡觉，早上醒来，因为我们有昼夜节律；
youdao
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We sleep at night and wake up in the morning because we have circadian rhythms;
我们在晚上睡觉，早上醒来，因为我们有昼夜节律；
youdao