紧急出口在公共汽车的尾部。

The emergency exit is at the back of the bus.

《牛津词典》

为了保持在水中不至于沉底，尾部的顶端比底端向后延伸，沿着后端形成一个斜面，产生提力。

To help generate lift to keep midwater, the top of the tail extends farther back than the bottom, creating a slant along the back edge.

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在20世纪60年代早期，研究人员试图将火箭尾部的电线发射到雷云中，以便于为这些雷云产生的巨大电荷建立一个简单的放电路径。

In the early 1960s, researchers tried firing rockets trailing wires into thunderclouds to set up an easy discharge path for the huge electric charges that these clouds generate.

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And that's like kind of hoping that the element you're searching for is the first in the list and the last in the list. Maybe.

也就是希望要找的元素,在数组的头部或者尾部,情况可能是这样的。

麻省理工公开课 - 计算机科学及编程导论课程节选