growl

例句：

1. 1. The dog growled at the stranger as he approached.
   当陌生人走近时，狗咆哮着。
2. 2. The lion roared loudly to scare off the predators.
   狮子大声咆哮以吓走捕食者。
3. 3. The bear grumbled in its sleep, complaining about the cold weather.
   熊在睡觉时发出抱怨寒冷天气的咕哝声。