If something hums, it makes a low continuous noise.
例句
The birds sang, the bees hummed...鳥兒叫，蜂兒鳴。Within five hours, the equipment will be humming away again...用不了5小時，設備就又能嗡嗡地運轉了。
VERB
哼（曲子）
When you hum a tune, you sing it with your lips closed.
例句
She was humming a merry little tune...她哼著一支歡快的小曲兒。He hummed to himself as he opened the trunk.他獨自哼著曲子打開了車子的后備箱。
VERB
(地方）熱鬧，活躍，繁忙
If you say that a place hums, you mean that it is full of activity.
例句
The place is really beginning to hum...這個地方真正開始熱鬧起來了。On Saturday morning, the town hums with activity and life.周六早晨，小鎮一派熱鬧繁忙，活力盎然。
CONVENTION
（躊躇時發出的聲音）嗯，呃
Hum is sometimes used to represent the sound people make when they are not sure what to say.
例句
Hum, I am sorry but I thought you were French.嗯，很抱歉，我以為你是法國人。
英漢詞典釋義
vt. & vi.
發出嗡嗡聲; 哼唱
The bees were humming in the garden.蜜蜂在花園里嗡嗡地叫。She is humming a folk song that I never heard before.她在哼一首我以前從未聽過的民歌。No one can hum him to draw his attention.沒有人可以用哼歌來吸引他的注意。
vi.
忙碌, 活躍
The new manager soon made things hum.這位新經理不久便使一切都活躍起來了。
n.
嗡嗡聲
We hear the hum of conversation from the next room.我們聽到隔壁房間嗡嗡的談話聲。
英英詞典釋義
Noun
1. the state of being or appearing to be actively engaged in an activity;
"they manifested all the busyness of a pack of beavers""there is a constant hum of military preparation"