A day on the planet mercury is twice as long as its year . mercury rotates very slowly but revolves around the sun in slightly less than eighty - eight days 水星上的一天比它的一年要长一倍。水星自转非常慢，但绕太阳公转一圈只需要不到88天。
2.
Lightning strikes the earth a hundred times every second from the 1 800 thunderstorms in progress at any given moment . a day on the planet mercury is twice as long as its year 地球上任何时候都有1 ， 800个雷雨在形成，其中每秒钟内有100个雷击中大地。
