v.发出嗡嗡声,哼唱( hum的现在分词 );忙碌,活跃;
例句:
He was humming a tune to himself.
他独自哼着一支曲子.
She was humming softly to herself.
她在轻声哼着曲子。
Within five hours, the equipment will be humming away again.
用不了5小时,设备就又能嗡嗡地运转了。