The continuation of biological rhythms in an organism without external cues attests to its having an internal clock.
在没有外部提示的情况下，生物体中生物节律依然能够延续，这能证明它体内有一个时钟。
Normally we depend on external cues to jog our memories.
通常我们通过外部客观的线索来提醒我们。
Normally the two timers are in step, and the external cues tend to regularise the internal clocks to the more convenient 24 hour period.
一般情况下，这两种定时器是步调一致的。外部信号常常调节人体时钟命使之达到更为便利的24小时周期。
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