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1. Oxford American Dictionary

   biological clock

   • IPA[ˌbīəˌläjək(ə)l ˈkläk]

   美式

   • n.
     an innate mechanism that controls the physiological activities of an organism which change on a daily, seasonal, yearly, or other regular cycle.

   • noun: biological clock, plural noun: biological clocks

2. • 更多解釋

   biological clock

   • IPA[bʌɪəˌlɒdʒɪkl ˈklɒk]

   英式

   • n.
     an innate mechanism that controls the physiological activities of an organism which change on a ...

   Oxford Dictionary