n. a complaint uttered in a low and indistinct tone
v. to utter or emit low dull rumbling sounds
n. 怨言, 满腹牢骚
vi. 抱怨, 发牢骚, 发隆隆声
vt. 抱怨
1. I always grumble when I have to wake up early for work.
我总是抱怨不得不早起上班。
2. She grumbled about the long wait at the restaurant.
她抱怨餐厅的等待时间太长。
3. They often grumble about the weather during winter.
他们常常抱怨冬天的天气。