You might save money with rebates, but you have to sit around forever waiting for the rebate check.

Torsten：你可能会用回扣省钱，但你必须永远坐在那里等待回扣支票。

Torsten says, " You might save money with rebates, but you have to sit around (you have to wait) forever for the rebate check." The " rebate check" is the money that the company is sending you back.

Torsten 说：“你可能会用回扣省钱，但你必须永远坐着（你必须等待）回扣支票。 “回扣支票” 是公司寄回您的钱。