Prices are fixed according to their quality，aren‘t they？
价格按质量的好坏而定，对吗？
The transferee must see to it that the quality of the product is maintained.接受转让一方要负责保持产品的质量。
Our Certificate of Quality is made valid by means of the official seal.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。