例句與造句

1. Photo : wheelchair athletes start at the sound of the signal gun as 30 , 000 runners await the next signal
   圖片：發(fā)令槍響，輪椅選手出發(fā)， 30000選手等待下一聲發(fā)令槍響。
2. It's difficult to find signal gun in a sentence. 用signal gun造句挺難的