He was humming a tune to himself.

他独自哼着一支曲子。

The garden was humming with the sound of bees.

花园里到处都是蜜蜂嗡嗡叫的声音。

The office was really humming with activity.

办公室里真是一片忙碌景象。

The school was always humming with activities.

这所学校一直活。

The bees were humming in the garden.

蜜蜂在花园里嗡嗡地叫。

The bees were humming around the hive.

蜜蜂在蜂箱周围嗡嗡地叫。

She is humming a folk song that I never heard before.

她在哼一首我以前从未听过的民歌。

She was humming to herself.

她独自哼着歌。