词典释义：
a brightly coloured rubber sac which is inflated with air and then sealed at the neck, and used as a child's toy or a decoration
气球。
a round or pear-shaped outline in which the words or thoughts of characters in a comic strip or cartoon are written
（漫画或卡通里书写人物语言或思想的）气球形圆框。
a large bag filled with hot air or gas to make it rise in the air, typically one carrying a basket for passengers
（尤指载客）热气球
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a hot-air balloon .热气球。
(亦作
球形大酒杯。
〈苏格兰，非正式〉蠢人。
swell out or cause to swell out in a spherical shape
鼓起；成球状突起
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the trousers ballooned out below his waist .他的裤子从腰下鼓了起来。
(of an amount of money spent, earned, or owed)increase rapidly
（支出、赚取或欠下的钱）迅速增多
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the company's debt has ballooned in the last five years 过去五年里公司债务迅速增长
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[as adj.
ballooning ]ballooning government spending .迅速增长的政府开支。
(of a person)increase rapidly and dramatically in weight
（人）体重迅速增加
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I ate out of boredom and I just ballooned up 我无聊就吃东西，结果体重猛增。
〈英〉（球）被踢（或打）得腾空飞起
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the ball ballooned into the air .球腾空高高飞起。
[with obj.]hit or kick (a ball) in such a way
（把球）踢飞；打飞
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he ballooned the penalty over the bar .他罚点球时把球从横梁上踢飞。
travel by hot-air balloon
乘热气球旅行
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he is famous for ballooning across oceans .他因乘热气球飞越大洋而出名。
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when （或before ）the balloon goes up informal when （or before） the action or trouble starts 〈非正式〉行动（或麻烦）开始时（或之前） -
［ORIGIN probably with allusion to the release of a balloon to mark the start of an event．］
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hot air balloon 热气球
真题例句：
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a balloon flight 气球飞行
真题例句：
"late 16th cent． （originally denoting a game played with a large inflated leather ball）： from French
