balloonn.气球；球状物vt.使膨胀vi.乘气球飞行；激增；如气球般膨胀adj.气球状的ballooningn.（气球的）操纵；热气球飞行动词balloon的现在分词形式.

1. Many people came to watch the weather balloon go up.
   许多人都来看天气探测气球升空。