They were flapping their bat - like fins before dropping back into the water with a terrific splash.它们拍打着蝙蝠般的鳍,然后随着令人恐惧的溅水声掉进了水中.The fins of a fish act as hydrofoils.鱼的鳍就像水翼船艇的水翼.Discarded fishing lines or nets entrap se...
Fins are a feature specific to fish.鱼鳍是鱼类特有的特征.He could see their wide, flattened, shovel - pointed heads now and their white tipped wide pectoral fins.他这时看得见它们那又宽又扁的铲子形的头,和尖端呈白色的宽阔的胸鳍.They were flapping their bat - like...