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。
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。
I only use it every other day now - mostly at night - and that is all I need.
我现在是隔天使用。主要是在晚上，而这是必须的。
I only use it every other day now - mostly at night - and that is all I need.
我现在是隔天使用。主要是在晚上，而这是必须的。
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