humming
adj. 发嗡嗡声的；精力旺盛的
n. 哼唱
v. 嗡嗡作响（hum 的 ing 形式）
例句
What's that tune you're humming?
你哼的是什么曲子？
《牛津词典》
The computers were humming away.
计算机在嗡嗡作响。
She was humming softly to herself.
她在轻声哼着曲子。
