这些阶段被称为“次昼夜的节拍周期。

These stages are called "sub-circadian rhythm cycle."

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这两种装置在阳光充足的气候条件下工作良好；但在北欧，太阳可能一次被云层遮挡数周，而温度不仅随着季节变化，而且还随着昼夜变化。

Both these devices worked well in sunny climates; but in northern Europe, the sun may be hidden by clouds for weeks at a time, while temperatures vary not only seasonally but from day to night.

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他摘下了这朵花，开始了他的不分昼夜旅行，直到又一次到达城堡。

He plucked the flower, and set out and travelled day and night, till he came again to the castle.

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