drone [drəʊn]

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n.雄蜂；不务正业而依赖他人为生者；v.发出嗡嗡声；混日子

a low continuous noise which does not change its note

The planes flew overhead with a low drone.飞机发出低沉的轰鸣声掠过头顶。
It's bad to drone.混日子是不好的。