誰都知道海水有潮汐現象。但很少有人知道大地也有“潮汐”发生。月球竭力把地球吸引向自己。結果使地球从地心到地表都发生变形。这样就在地球表面形成了两个潮峰——一个朝向月球,另一个与此相反。地球繞自己的軸旋转,同时月球又 Everyone knows that there is tidal phenomenon in seawater. However, few people know that the earth also has a “tidal wave”. The moon strives to attract the earth to itself. As a result, the earth is deformed from the center of the earth to the earth’s surface. This creates two peaks on the Earth’s surface - one toward the moon and the other to the opposite. Earth rotates around its own axis while the moon