balloon，名词，意思是气球，例如：

1、We watched the balloon riding high above the fields.我们看着气球高高地飘浮在田野上空。

2、That balloon's going to burst.气球马上要爆了。

3、She jumped as someone popped a balloon behind her.有人在她背后弄爆了一个气球，把她吓了一跳。