hair insulates animals against the sun by day as well as against the cold by night.
毛发使得动物可以在白天抵挡阳光,在夜晚抵挡严寒。
on day four, the heavenly bodies that give off light by day or night are created.
在第四天,那些在白天或者晚上发光的天体被创造了。
by day three, i was getting a touch of pyongyang cabin fever, so it was a relief to leave the city and drive up into the mountains to visit the international friendship exhibition.