1. （猫等满足地）发出呼噜声
    When a cat purrs, it makes a low vibrating sound with its throat because it is contented.

    e.g. The plump ginger kitten had settled comfortably in her arms and was purring enthusiastically.
           胖乎乎的姜黄色小猫惬意地躺在她的怀里，大声地打着呼噜。

2. （机器等）发出持续低沉的声音，发隆隆声
    When the engine of a machine such as a car purrs, it is working and making a quiet, continuous, vibrating sound.

    e.g. Both boats purred out of the cave mouth and into open water...
           两艘船隆隆地从洞口开出，进入了开阔的水域。
    e.g. The Rolls Royce purred down the country road.
           那辆劳斯莱斯沿着乡村小路咕隆隆地开走了。

3. （人愉快或劝说别人时）轻柔地说话
    When someone purrs, they speak in a soft, gentle voice because they are pleased or because they want to persuade you to do something for them.

purr

    e.g. ''You can tell me the truth,'' she purred.
           “你可以告诉我真相，”她轻声说。

1. a low vibrating sound typical of a contented cat

1. indicate pleasure by purring
    characteristic of cats

    Synonym: make vibrant sounds

2. make a soft swishing sound

    e.g. the motor whirred
           the car engine purred

    Synonym: whizzwhizwhirrwhirbirr