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VERB
發出連續而低沉的聲音;發嗡嗡聲
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。
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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。
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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。
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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。