1·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。
2·Not only that, but when a wave threatened to return the seal to danger, the humpback used its massive flipper (at five metres, the longest in the animal kingdom) to nudge it back on.
不仅如此，当一个浪头即将把海豹扫回险境之时，座头鲸还利用它的巨大的鳍状肢(五米长，动物王国中最长的)把它轻轻地推了回来。
3·When this inland sea retreated, Hamilton hypothesizes, the Amazon dolphins remained in the river basin, evolving into striking creatures that bear little resemblance to our beloved Flipper.
哈密尔顿推测，当这片内陆海退去，亚马逊河豚却留了下来，逐渐进化为一种恐怖动物，与我们钟爱的鳍状肢动物，外貌上已大相径庭了。
4·An anterior appendage, such as a leg, wing, or flipper.
前肢，上肢动物前部的附肢，如前腿、前翅、前鳍等。