#在液體中移動
#在液體中導航
#move in liquids
#navigate through liquid
鰭運動有助於向後和向前游泳 (Fin Movements Aid in Swimming Backward and Forward)
刀魚波浪狀的鰭使其能夠向前和向後游泳，並通過產生推進水射流使其漂浮。
(The undulating fin of the knifefish enables it to swim forward and backward, as well as keep it afloat, by creating propulsive water jets.)
