例如，如果一只信鸽要用它的太阳罗盘进行导航，它必须根据日光/黑暗的循环所提供的线索正确设置时间。

For instance, if a homing pigeon is to navigate with its Sun compass, its clock must be properly set by cues provided by the daylight/darkness cycle.

youdao

前一天下了雪——在一年中几乎没有黑暗的时候，会有一种奇怪的感觉——但周日，太阳照耀着湖面。

It snowed the day before — giving a strange feeling at a time of year when there is virtually no darkness — but on Sunday the sun blazed across the water.

youdao

闪光过去，是比刚才更黑的黑暗，还有死寂······等他清醒过来，太阳已经升得老高了，森林里到处是鸟的叫声。

Then there were darkness blacker than before, and silence; and when he returned to consciousness the sun was high and the wood vocal with songs of birds.

youdao