2-- I think so, too. Our only request is that the quality is in conformity with the contract stipulations.

1-- Don't worry. Our quality is based solely on our sales samples.

2-- But what will you do if the goods we receive are not standard?

1-- We are sure to responsible to replace the defective ones.

2-- That's great.

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注解：
 
1.negotiation谈判  
2.request要求  
3.defective有缺点的 

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译文：

1--关于价格的谈判已经花了我们很长时间，我希望接下来关于质量的谈判能快一些。

2--我也这样认为。我们唯一的要求就是质量与合同规定的相符。

1--不用担心，我们的质量完全以货样为准。

2--可是如果我们收到的货物未达到标准，你们怎么处理呢？

1--我们一定保换质量不合格的产品。

2--那太好了。