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N-COUNT
（经济的）繁荣，景气
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...
接着出现了经济繁荣，尤其是在房地产业和建筑业。
The 1980s were indeed boom years.
20世纪80年代是真正的繁荣时期。
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N-COUNT
（数量的）增长；（频率的）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...
该项体育运动的兴起意味着制定更加严格的安全规则的呼声更高了。
Public transport has not been able to cope adequately with the travel boom.
公共交通系统还不能充分满足迅速发展的旅游业的需求。
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VERB
（经济或生意）景气，繁荣
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年经济一直很繁荣。
Sales are booming...
销售额在快速增长。
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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
浮木挡栅，水栅（用来阻挡溢出的油扩散）
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）发隆隆声
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.'...
“女士们，”海伦娜大声喊道，没有用麦克风，“我们都知道今晚我们为什么来到这里。”
Thunder boomed like battlefield cannons over Crooked Mountain.
雷声像战场上的炮声一样响彻克鲁克德山。