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...
有相当一部分普通员工不理睬工会的建议。Substantial numbers of rank and file members ignored their union's advice.亚瑟王的故事成为口头传说的一部分。The story of King Arthur became part of oral tradition.细胞不断地分裂更新，这是人体发育过程的一部分。Cells divide and renew as p...