Some of them fly for thousands of kilometers and mostly at night.

它们之间的一部分在飞上几千公里，并且大部分是在晚上飞行。

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Individual dolphins also enter a deeper form of sleep, mostly at night.

个别海豚也会睡得较沉，特别是在夜间。

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In captivity, the giraffe sleeps intermittently around 4.6 hours per day, mostly at night.

笼子里的长颈鹿每天大约会断断续续地睡4.6小时，大部分时间是在晚上。

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They eat mostly at night.

VOA: special.2009.05.26

Cars batteries are a good match with wind power because they mostly charge at night, when people are sleeping, and wind tends to peak at night.

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Though seeing a newborn turtle make its way to the ocean is unlikely ('They mostly hatch at night, ' says Pakdin), swimmers may see a full-grown green turtle travel across the seabed.

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The thought ten years ago was that they would mostly be charged at night, filling in the valley of low off-peak demand, and thus allowing more kilowatt-hours to flow across the same infrastructure.

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