Though the giraffe's neck is about 9 feet long, it contains the
same number of vertebrae as a mouse's---seven. The giraffe's tongue is 18 inches long. It can open and close its nostrils at will, can run faster than a horse, and makes almost no sound whatsoever.
尽管长颈鹿的脖子约有9英尺长，它和老鼠的颈椎骨的数目一样，只有7块。长颈鹿的舌头有18英寸长。它能任意开闭鼻孔，能跑得比马快而几乎不发出任何声音。
A horse focuses its eye by changing the angle of its head, not by changing the shape of the lens of the eye, as humans do.
马通过转动头的角度使眼镜聚焦，不象人那样通过改变瞳孔的形状聚焦。
