动词 purr:

1. make a soft swishing sound

2. indicate pleasure by purring; characteristic of cats

purrv.(猫等满足地)呜呜叫；(机器等)发出低沉震颤声；(人)发出愉快的声音n.(猫等满足时)呜呜的叫声；(机器等)低沉的颤动声；人高兴发出的声音

1. Sensitivity to this type of purring may even be innate in humans, drawing from a primal drive to respond to crying babies.
   这种呜呜叫声类型的敏感性，甚至可能在人类来说是与生俱来的，从原始的驱动器绘图回应嗷嗷待哺的婴儿。