hum

hum1
(hummed, humming)
[no obj.]
  1. make a low, steady continuous sound like that of a bee
    发连续低沉的声音（如蜜蜂的嗡嗡声）
    the computers hummed.
    计算机发出嗡嗡声。
    ■sing with closed lips
    哼曲子
    he hummed softly to himself.
    他轻轻地自己哼着曲子。
    [with obj.]she was humming a cheerful tune.
    她哼着一首快乐的曲子。
    ■(of a place) be filled with a low, steady continuous sound
    （地方）发嘈杂声
    the room hummed with an expectant murmur.
    满怀期待的低语声充斥了整间屋子。
    ■(informal)be in a state of great activity
    (非正式)忙碌，活跃
    the repair shops are humming as the tradesmen set about their various tasks.
    手艺人各自开始着手干活时，修理店一片忙碌。
  2. (Brit. informal)smell unpleasant
    (英，非正式)发出难闻的气味，发臭
    when the wind drops this stuff really hums.
    风势减弱时，这东西的味道的确很难闻。
noun
  1. [in sing.]a low, steady continuous sound
    连续低沉的声音
    the hum of insects.
    昆虫的嗡嗡声。
    a low hum of conversation.
    嗡嗡的低声交谈声。
    ■an unwanted low-frequency noise in an amplifier caused by variation of electric current, especially the alternating frequency of the mains
    （电流变化，尤指总输电线交互频率引起的扩音器的）低频噪音
常用词组
hum and haw (或ha)
  1. (Brit.)hesitate; be indecisive
    (英)犹豫不决，优柔寡断
派生
hummable
adjective
hummer
noun
语源
  1. late Middle English: imitative
hum2
exclamation
  1. used to express hesitation or dissent
    ［用于表示犹豫或不同意］嗯！呣！哼！
语源
  1. mid 16th cent.: imitative; related to the verb hum
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