我们的质量证明书盖公章方为有效。 

    We'll improve the quality of our products and production efficiency. 

    我们将改进产品质量，提高生产率。 

    They are fully qualified to pass opinions on the quality of this merchandise. 

    他们完全有资格对这种产品的质量发表意见。 

    We would like to have you offer us 100 metric tons, quality same as last. 

    希望您能报给我们100吨质量和上次相同的货。 

    We find the quality suitable (unsuitable) for our market. 

    产品质量适合（不适合）我们的市场。 

    We always have faith in the quality of your products. 

    对你们产品的质量我们总是很信任。 

    Words and Phrases 

    quality 质量，品质 

    qualitative 质量的 

    qualitatively 在质量上 

    quality clause 品质条款 

    quality certificate 品质证明书 

    quality of export and import commodities 进出口商品质量 

    good merchantable quality 全销质量 

    to be in conformity with 与...一致 

    transferer 转让者

    transferee 受让者