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N-COUNT
（經濟的）繁榮，景氣
If there is a boom in the economy, there is an increase in economic activity, for example in the amount of things that are being bought and sold.
例句
An economic boom followed, especially in housing and construction...
接著出現了經濟繁榮，尤其是在房地產業和建筑業。
The 1980s were indeed boom years.
20世紀80年代是真正的繁榮時期。
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N-COUNT
（數量的）增長；（頻率的）加快；成功
A boom in something is an increase in its amount, frequency, or success.
例句
The boom in the sport's popularity has meant more calls for stricter safety regulations...
該項體育運動的興起意味著制定更加嚴格的安全規則的呼聲更高了。
Public transport has not been able to cope adequately with the travel boom.
公共交通系統還不能充分滿足迅速發展的旅游業的需求。
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VERB
（經濟或生意）景氣，繁榮
If the economy or a business is booming, the amount of things being bought or sold is increasing.
例句
By 1988 the economy was booming...
到1988年經濟一直很繁榮。
Sales are booming...
銷售額在快速增長。
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N-COUNT
（船帆的）下桁；帆桁
On a boat, the boom is the long pole which is attached to the bottom of the sail and to the mast and which you move when you want to alter the direction in which you are sailing.
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N-COUNT
浮木擋柵，水柵（用來阻擋溢出的油擴散）
A boom is a large floating barrier that is used for stopping oil that has spilled from spreading.
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VERB
（人)吼叫；（大炮或大鼓）發隆隆聲
When something such as someone's voice, a cannon, or a big drum booms, it makes a loud, deep sound that lasts for several seconds.
例句
'Ladies,' boomed Helena, without a microphone, 'we all know why we're here tonight.'...
“女士們，”海倫娜大聲喊道，沒有用麥克風，“我們都知道今晚我們為什么來到這里。”
Thunder boomed like battlefield cannons over Crooked Mountain.
雷聲像戰場上的炮聲一樣響徹克魯克德山。