Cadets are using football rattles to simulate gunfire because blank ammunition is too costly.空包弹太昂贵了,军校学员不得不用足球比赛时助威用的响板来模拟枪声。Cadets are having to use football rattles to simulate gunfire because blank ammunition is too costly.空包弹太昂贵了,军校学员不得不用足球比赛时助威用的响板来模拟枪声。