通过把气球套在一个杯子（或者其他的柱状容器）开口上，就可以制作一个号角了。通过小孔吹气，就能响。

A simple airhorn can be constructed by stretching a balloon over the opening of a small container or cup with a tube through the other end (see Figure).

youdao

通过把气球套在一个杯子（或者其他的柱状容器）开口上，就可以制作一个号角了。通过小孔吹气，就能响。

A simple airhorn can be constructed by stretching a balloon over the opening of a small container or cup with a tube through the other end (see Figure).

youdao