translation.en: The other thing is, most boats, when they reach a certain speed, and they are going on waves, they start to hit and slap on the surface of the water, and a lot of the energy moving forward is lost.
translation.zh: 另外， 大部分船， 当它们达到 一定的速度，而且在风浪中航行的时候 它们就会撞击和拍打水面 这样就会消耗很多前进的能量