n.[C]

1. （雷，大砲等的）隆隆聲；（波浪的）澎湃聲；（蜂等的）嗡嗡聲
2. （商業等的）景氣，繁榮；（政治形勢等的）突然好轉
   The city is having a building boom.

   這個城市正在大興土木。

3. 激增，暴漲

vi.

1. 發出隆隆聲（或嗡嗡聲等）
   The big guns boomed in the distance.

   遠處大砲聲隆隆作響。

2. 聲音隆隆而過
3. 激增，暴漲；迅速發展，興旺
   The county boomed when gold was discovered there.

   那個縣在發現了黃金後便繁榮起來。

   Business boomed after the depression.

   蕭條之後生意興隆起來。

4. 名聲大噪

vt.

1. 用隆隆聲表達[（+out）]
   The foghorn boomed out its warning.

   霧角鳴聲示警。

2. 使迅速發展；使興旺；使出名
   Foreign investments boomed the city.

   國外投資使這個城市迅速繁榮起來。

3. 為……大力鼓吹

n.[C]

1. 吊杆；帆的下桁，帆杠
   The sail fell off the boom.

   帆從帆杠上掉下來了。

2. 柵欄，（河中防止木頭向下游流去或船上行的）欄木或橫江鐵索，橫江鐵索，河中標柱
   The booms kept the logs from flowing away.

   柵欄擋著原木，不讓它們飄走。

3. （起重機的）臂；（相機等的）支臂
   The long boom of the crane functions like our arms.

   起重機的長臂與我們的手臂功能相同。

4. 【空】（飛機的）尾桁
   The boom of the airplane was damaged.

   飛機的尾桁受到損害。

n.

v.

n.

v.

n.

1. a pivoted spar to which the foot of a vessel's sail is attached.
2. a movable arm carrying a microphone or film camera.
3. a floating beam used to contain oil spills or to form a barrier across a harbour mouth.