boom

US /bum/

UK /bu:m/

B1 中級英檢高級
n. (c./u.)名詞 (可數/不可數)迅速發展;興旺
There was a population boom in this area in the 1970s
v.i.不及物動詞景氣;繁榮
Economies tend to boom and bust in cycles
v.i.不及物動詞轟隆響聲 ; 獨角仙等的振翅聲
Guns boom loudly when you shoot them
n. (c./u.)名詞 (可數/不可數)(雷;大砲等的)隆隆聲
The boom of the gun could be heard half a kilometer away

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