原文：We feel sure that a fair comparison in quality between our products and similar articles from other sources will convince you of the reasonableness of our quotations.
译文：我们很确定，只要我方产品质量同其他来源的类似产品有一个公平的比较，那将说服你，我方报价的合理性。

原文：We feel sure that a fair comparison in quality between our products and similar articles from other sources will convince you of the reasonableness of our quotations.
译文：我们很确定，只要我方产品质量同其他来源的类似产品有一个公平的比较，那将说服你，我方报价的合理性。

修改：我们坚信，只要将我方产品质量同其他来源的类似产品质量好好地比较，你就会发现，我方的报价合情合理。