对话文本
A: Is there any way we could get a better warranty on this product?

B: Well, I can't give you a betterwarranty, if you would be willing to agree to an annual contract.

A: That might not be ideal because there would be some drawbacks to an annual contract situation that might make it difficult to sell to our buyers. What about free delivery? If we make a large enough order, could you waive the deliver fee?

B: Yes, our delivery fee could be waived, if you make an order of 50 units or more. We would have to insist on the annual contract, however. I understand it's not the most convenient for you. Perhaps we could shorten it to a sixth month contract if you are willing to take a lower rebate.

A: That would be fine. We could accept a lower rebate.

参考翻译
这种产品还有没有条件更优惠的保单?
有的,如果你们同意签一年的合同,我就给你们提供更优惠的保单.
签一年的合同对我们不利,因为那样会很难卖给我们的买主,所以那不是理想的解决办法.免费送货怎么样?如果我们的订单够大,你们能免去运费吗?
可以,如果你们订50套或者更多的话,我们可以免送货费.不过,我们还是要坚持签一年的合同.我明白这对你们不是最合适的,如果你们愿意把回扣降低的话,也许我们可以缩减为半年的合同.
这样就很好.我们接受低回扣.

核心词汇
Warranty: a written agreement in which a company selling sth promises to repair or replace it if there is a problem within a particular period of time (商品)保用单
The television comes with a full two-year warranty.
这台电视机有整两年的保修期.
Is the car still under warranty?
这辆汽车仍在保修期内吗?

Drawback: a disadvantage or problem that makes sth a less attractive idea 缺点;不利条件
The main drawback to it is the cost.
它的主要缺点是成本高。
This is the one major drawback of the new system.
这是新系统的一大弊端。

Delivery: he act of taking goods, letters, etc. to the people they have been sent to 传送;递送;交付
a delivery van
厢式送货车
Please pay for goods on delivery(= when you receive them).
请货到付款。
Allow 28 days for delivery.
请留出 28 天送货时间。
Is there a postal/mail delivery on Saturdays?
星期六送邮件吗？
When can you take delivery of(= be available to receive)the car?
你何时能提取那辆汽车？
the delivery of public services
提供公共事业服务

Waive: to choose not to demand sth in a particular case, even though you have a legal or official right to do so 放弃(权利、要求等)

Rebate: an amount of money that is taken away from the cost of sth, before you pay for it 回扣,返还(退还的部份货价);折扣
Buyers are offered a cash rebate.
购买者享受现金回扣.