这些飞行动物不是在日间活动就是昼伏夜出。
These winged creatures are either active during the day, or nocturnal.
吸血鬼冷酷、孤傲、俊美、昼伏夜出，正如喜怒无常的十几岁男孩。
Vampires are cool, aloof, beautiful, brooding creatures of the night. Typical moody teenage boys, basically.
现在濒危物种法案正在保护这些昼伏夜出的动物免遭与渡渡鸟同样的厄运。
Habitat saved under the Endangered Species Act (ESA) prevented these nocturnal mice from going the way of the dodo.
与其他非洲野生动物相比，豹子极少抛头露面，想要一睹其真容实属难事，这部分缘于它们昼伏夜出的捕食习性。
Compared with other African game, leopards are famously shy and rarely seen, partially because of their largely nocturnal hunting habits.
水泥池养殖的杂交鲟具有昼伏夜出习性，深水网箱养殖的杂交鲟流急时在网箱底部活动、流缓时到水层中游动；
The hybrid sturgeon in cement pool had the habit of hiding during the day and coming out at night, while that in deep water cage stayed at the base in riptide and swam in slack tide.
美国的研究人员进行了一项实验，他们让一种习惯昼伏夜出的小老鼠白天不睡觉，以此来研究它们大脑的活动情况。
US researchers studied the brain activity of rats kept awake during the day - the time they would usually sleep.
把小老鼠当做实验品，他们发现强光增强了老鼠的恐惧和焦虑，因为老鼠属于昼伏夜出的生物，同样，因为人类通常在白天活动，黑暗就增加了他们的恐惧和焦虑。
Using mice as models, they learned that intense light enhances fear or anxiety in mice, which are nocturnal, in much the same way that darkness can intensify fear or anxiety in diurnal humans.
把小老鼠当做实验品，他们发现强光增强了老鼠的恐惧和焦虑，因为老鼠属于昼伏夜出的生物，同样，因为人类通常在白天活动，黑暗就增加了他们的恐惧和焦虑。
Using mice as models, they learned that intense light enhances fear or anxiety in mice, which are nocturnal, in much the same way that darkness can intensify fear or anxiety in diurnal humans.
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