1. The seal's flipper is homologous with the human arm. 海豹的鳍肢与人类的手臂同源。
2. Amazon dolphins bear little resemblance to our beloved Flipper. 亚马逊河豚和我们钟爱的鳍状肢动物一点儿都不像。
3. The green sea turtle, could only swim around in a very limited range because she only had one flipper. 这只绿海龟只能在很有限的范围里游，因为她只有一只鳍。
4. There is not much that the turtle can do about this without compromising the aerodynamic shape of the flipper. "如果海龟没有符合流体动力学结构的鳍的话，他们也不能解决这个问题。
5. The leatherback accomplishes this by arranging the blood vessels in the base of its flipper into a countercurrent exchange system. 棱皮龟通过将鳍状肢底部的血管排列成逆流交换系统来完成这一过程。
