We'd assumed we'd have to give it a moving head and tail, facial features, and put a scene on it to make it smell like a real rat, but that wasn't necessary.

我们认为我们必须给它一个移动的头和尾巴，面部特征，并给它一个场景，使它闻起来像一只真正的老鼠，但这是不必要的。

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The simplest are head and tail.

最简单的就是head和tail。

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Next time, we'll take a look at head and tail.

下回我们将看一下head和tail。

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For example, that embryo that I showed on one of the first slides where there's clearly a head region and a tail region.

比如我在第一张幻灯片里展示的那种胚胎,已经有了明显的头部和尾部

耶鲁公开课 - 生物医学工程探索课程节选

There's a region that looks the head, and a region that looks more like the tail.

有一个区域看起来像头,另一个区域看起来像尾

耶鲁公开课 - 生物医学工程探索课程节选

Different kinds of polarity form, there's a head, and there's a tail, there's a back, there's a front, there's a left side and there's a right side.

不同的极性开始形成,有头端,也有尾端,有后面,也有前面,有左侧,也有右侧

耶鲁公开课 - 生物医学工程探索课程节选

In fact, serving fish with the head and tail intact is thought to bring in a good beginning and end to the year.

FORBES: Here Comes the Rabbit with Luck and Prosperity for All - Vegas Style

This snarling, fire-snorting Chimera, which has a storied history, epitomizes the mythical monster that figures in many classical Greek texts and was first mentioned, among those that survive, in Homer's "Iliad": it's a dramatic fusion of a lion's head and body, a serpent forming the tail, and a horned, bearded goat's head and neck protruding from the spiked spine of the lion.

WSJ: The Imaginary Made Nearly Read | The Chimera of Arezzo | Masterpiece by Judith H. Dobrzynski

Dr Fril has used this knowledge to create a FrenchFlag fish, with a blue head, a white body and a red tail, and hopes to follow it soon with one depicting the stars and stripes.

ECONOMIST: Genetic engineering