The seal's flipper is homologous with the human arm.海豹的鳍肢与人类的手臂同源。It's almost like a flipper action as she kicks down.她向下踢腿时有鱼鳍的效果.Flipper? Maybe those frisky crowd - pleasers at the aquarium?鳍状肢? 或许是水族馆中那些活泼逗人...
跳水在中国的受欢迎程度确保了水立方的上座率.Diving's popularity in China should ensure that filled tocapacity.北京水立方的泳池是三米深, 相形之下,很多竞赛用泳池只有两米深.The pool in Beijing is three meters deep, compared with two meters for many racing pools....