例句與造句

1. 8 . should the optional switch is selected of heel seat cementing and no cementing, side cementing or no cementing or side and heel seat cementing or no cementing separately
   8.本機并可選擇單獨使用后幫中幫中后幫之擦膠興不擦膠之操作方式。
2. It's difficult to find optional switch in a sentence. 用optional switch造句挺難的