沙漠，为什么白天热晚上冷？

Deserts are burning hot in the day. 沙漠白天热得像火烧。 But at night, the temperature drops fast. 可一到晚上，温度跳水一样降。 Sand cannot hold heat very well. 沙子存不住热量。 When the Sun goes down, the heat leaves. 太阳一落山，热气就跑光。 Nights in the desert can be really cold. 沙漠的晚上能冷得够呛。 That is the strange desert temperature swing. 这就是沙漠奇怪的温差。