sale on:
销售在
She was ringing up her sale onan ancient cash register.
她在把销售额记入那台老旧的收款机。
on sale:
廉价出售贱价抛售
Tickets are on sale from the booking office.
售票处正在售票。
This type of camera is on sale in my store now.
这种型号的照相机目前在我的店里降价出售。
These pants are on sale for $10.
这条裤子打折，只要10美金。
