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单词 ultradian
释义 ultradian/ʌlˈtreidiən/adj. Physiol. (of a rhythm or cycle) having a period of recurrence shorter than a day but longer than an hour (cf. 参见 INFRADIAN) 【生理】次昼夜的(节奏间隔或周期长度小于一天大于一小时) [from ULTRA-, as having a higher frequency than circadian]
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