这种鲸保留了尾巴，没有现代水生鲸类动物用于行动的主要部位，尾片。
The whale retained a tail and lacked a fluke, the major means of locomotion in modern cetaceans.
不过，走鲸的脊椎结构显示，即使没有尾片，它们在水中同样能够像现代鲸鱼那样通过身体后面部分的上下摆动来游动。
The structure of the backbone shows, however, that Ambulocetus swam like modern whales by moving the rear portion of its body up and down, even though a fluke was missing.
最后的调用（尾（tail））只是调用函数，没有任何过程调用或栈维护开销。
The last call (the tail) simply invokes the function without any procedure call or stack maintenance overhead.
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