【英语时差8,16】猫咪的咕噜声（上）

 Scratch a friendly cat behind the ears and she’s likely to reward you with a deep purring. Have you ever wondered exactly how a cat makes this noise, and why a cat would want to do so in the first place? There have been a number of theories about how cats purr. For example, scientists once thought that purring resulted from the turbulent flow of blood within the cat’s chest, rather like the babbling¹ of water over an uneven² river bed. Another theory holds that purring is essentially³ a type of snoring, where the cat’s air stream is interrupted by a structure in the cat’s larynx. The most likely explanation, however, is that purring is caused by a rapid, rhythmic⁴ contraction⁵ of the muscles of the larynx and diaphragm.

1 babbling   

n.胡说，婴儿发出的咿哑声adj.胡说的v.喋喋不休( babble的现在分词 )；作潺潺声（如流水）；含糊不清地说话；泄漏秘密

参考例句：

• I could hear the sound of a babbling brook. 我听得见小溪潺潺的流水声。 来自《简明英汉词典》
• Infamy was babbling around her in the public market-place. 在公共市场上，她周围泛滥着对她丑行的种种议论。 来自英汉文学 - 红字

2 uneven   

adj.不平坦的，不规则的，不均匀的

参考例句：

• The sidewalk is very uneven—be careful where you walk.这人行道凹凸不平—走路时请小心。
• The country was noted for its uneven distribution of land resources.这个国家以土地资源分布不均匀出名。

3 essentially   

adv.本质上，实质上，基本上

参考例句：

• Really great men are essentially modest.真正的伟人大都很谦虚。
• She is an essentially selfish person.她本质上是个自私自利的人。

4 rhythmic   

adj.有节奏的，有韵律的

参考例句：

• Her breathing became more rhythmic.她的呼吸变得更有规律了。
• Good breathing is slow,rhythmic and deep.健康的呼吸方式缓慢深沉而有节奏。

5 contraction   

n.缩略词，缩写式，害病

参考例句：

• The contraction of this muscle raises the lower arm.肌肉的收缩使前臂抬起。
• The forces of expansion are balanced by forces of contraction.扩张力和收缩力相互平衡。