1. 發(fā)出連續而低沉的聲音;發(fā)嗡嗡聲 If something hums, it makes a low continuous noise.
e.g. The birds sang, the bees hummed... 鳥(niǎo)兒叫，蜂兒鳴。 e.g. Within five hours, the equipment will be humming away again... 用不了5小時(shí)，設備就又能嗡嗡地運轉了。
2. 哼（曲子） When you hum a tune, you sing it with your lips closed.
e.g. She was humming a merry little tune... 她哼著(zhù)一支歡快的小曲兒。 e.g. He hummed to himself as he opened the trunk. 他獨自哼著(zhù)曲子打開(kāi)了車(chē)子的后備箱。
humming The guard stopped his humming and turned his head sharply. 守衛停止了哼唱，猛地轉過(guò)頭。
3. (地方）熱鬧，活躍，繁忙 If you say that a place hums, you mean that it is full of activity.
e.g. The place is really beginning to hum... 這個(gè)地方真正開(kāi)始熱鬧起來(lái)了。 e.g. 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。
4. （躊躇時(shí)發(fā)出的聲音）嗯，呃 Hum is sometimes used to represent the sound people make when they are not sure what to say.
e.g. Hum, I am sorry but I thought you were French. 嗯，很抱歉，我以為你是法國人。
5. see also: ho hum hum and haw -> see haw
hum英英釋義
noun
1. a humming noise
e.g. the hum of distant traffic
Synonym: humming
2. the state of being or appearing to be actively engaged in an activity
e.g. they manifested all the busyness of a pack of beavers there is a constant hum of military preparation