purr

名词 purr:

1. a low vibrating sound typical of a contented cat

动词 purr:

1. make a soft swishing sound
   同义词：whizz, whiz, whirr, whir, birr
2. indicate pleasure by purring; characteristic of cats
   同义词：make vibrant sounds

1. I heard a car engine purring smoothly.
   我听到一辆汽车发动机发出平稳的轰隆声。
2. The cat purred loudly.
   那只猫大声地发出呼噜呼噜声。

purr

n.（名词）
The soft vibrant sound made by a cat.
呼噜声，呜呜声：猫发出的轻柔颤动的声音
A sound similar to that made by a cat:
和猫发出的呼噜声相似的声音：
例句：
the purr of an engine.
机器的隆隆声

v.（动词）
purred,purr.ing,purrs
v.intr.（不及物动词）
To make or utter a soft, vibrant sound:
产生或发出一种轻柔且颤动的声音：
例句：
The cat purred. The sewing machine purred.
猫发出呜呜声。缝纫机呜呜地响着

v.tr.（及物动词）
To express by a soft, vibrant sound.
用轻柔振颤的声音表达

来源：
[Imitative]
[拟声词]