Then during the late fall and winter as the clock "ticks", certain physiological changes occur in the bird.

在之后的深秋和冬天，如同钟的转动一样，特定的生理变化在鸟类的身体上表现出来。

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TINKERING with the circadian clock, the day-and-night cycle in the physiological processes of all living beings, is rarely a good idea.

捣乱生物钟——万物生灵生理过程中的昼夜节律——绝不是个好主意。

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Biorhythm a periodic physiological or behavioral change that is controlled by a biological clock. Circadian rhythms are an example.

生物节律：由生物钟控制的周期性的生理上的或行为上的变化。昼夜节律就是一个很好的例子。

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