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VERB
（人）吼叫，咆哮
If someone bellows, they shout angrily in a loud, deep voice.
例句
'I didn't ask to be born!' she bellowed...
“我沒有要求你們把我生下來！”她吼道。
She prayed she wouldn't come in and find them there, bellowing at each other...
她祈禱自己進來后不會看到他們沖著彼此大吼大叫。
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VERB
（公牛、大象等大型動物）咆哮，吼叫
When a large animal such as a bull or an elephant bellows, it makes a loud and deep noise.
例句
A heifer bellowed in her stall.
小母牛在牛欄里吼叫。
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N-COUNT
風箱；鼓風機
A bellows is or bellows are a device used for blowing air into a fire in order to make it burn more fiercely.
例句
...two stone forges, each equipped with bellows.
兩個都配有風箱的石頭熔爐