为什么一天有24个小时?

来源：阅读, 2020, (69): 48.

<正>The earth rotates on its axis.It takes 24 hours for the earth to rotate once.Every time it goes around,24 hours pass.We call that a"day".That is why a day is 24 hours.Sometimes the day seems longer if we are not feeling well.Sometimes it seems shorter when we are having fun.But it is still 24hours.