- adj. 发嗡嗡声的；精力旺盛的
- n. 哼唱
- v. 嗡嗡作响（hum的ing形式）
- 1. The guard stopped his humming and turned his head sharply.
- 2. There was a low humming sound in the sky.
- 3. Within five hours, the equipment will be humming away again.
- 4. The rooms are crammed with humming Xerox machines.
- 5. She was humming softly to herself.
[ humming 造句 ]