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VERB
				发出连续而低沉的声音;发嗡嗡声
				If something hums, it makes a low continuous noise.
例句
						The birds sang, the bees hummed...
						鸟儿叫,蜂儿鸣。
						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。 
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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...
						她哼着一支欢快的小曲儿。
						He hummed to himself as he opened the trunk.
						他独自哼着曲子打开了车子的后备箱。 
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VERB
				(地方)热闹,活跃,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...
						这个地方真正开始热闹起来了。
						On Saturday morning, the town hums with activity and life.
						周六早晨,小镇一派热闹繁忙,活力盎然。 
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CONVENTION
				(踌躇时发出的声音)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,我以为你是法国人。