Most other fish have tails that are essentially symmetrical from top to bottom.
其他鱼的尾巴基本上都是从上到下对称的。
2
Flying fish can whip their tails back and forth with tremendous speed to propel themselves out of the water.
飞鱼能够极速来回摇摆鱼尾，将自己推出水面。
3
He swam over the deepest parts of the ocean where the water is so deep that it is inky black at the bottom and the fish carried lanterns over their heads and some have lights on their tails.