bell and hopper

例句：

1. 1. The bell and hopper systemis a popular payment method in many stores.
   铃铛和投币机系统是许多商店中受欢迎的支付方式。
2. 2. The bell andhopper system is a popular payment methodin many stores.
   铃铛和投币机系统是许多商店中受欢迎的支付方式。
3. 3.The bell and hopper system is apopular payment method in many stores.
   铃铛和投币机系统是许多商店中受欢迎的支付方式。