N-COUNT 气球 A balloon is a small, thin, rubber bag that you blow air into so that it becomes larger and rounder or longer. Balloons are used as toys or decorations.
She popped a balloon with her fork. 她用叉子戳破了一个气球。
N-COUNT 热气球 A balloon is a large, strong bag filled with gas or hot air, which can carry passengers in a container that hangs underneath it.
They are to attempt to be the first to circle the Earth non-stop by balloon. 他们试图完成乘热气球不间断环球飞行的创举。
VERB (数量)激增,猛涨,快速膨胀 When something balloons, it increases rapidly in amount.
In London, the use of the Tube has ballooned... 在伦敦,坐地铁的人激增。
The budget deficit has ballooned to $25 billion... 预算赤字已经猛增到250亿美元。