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。

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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。

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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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Samsung's new external drives for desktop PCs offer up to 2TB capacity in simple and refined cases, which take their design cues from the portable drive family.

ENGADGET: Samsung spices up the USB 3.0 hard drive party with three new models