产品品质决定买卖本质上的价值，因此它是非常重要的买卖原因之一。贸易上的品质决定办法有：凭样品交易，凭标准交易，凭规格交易等。下面大家来看看有关品质的表达法。
优质：quality is excellent/ superior/ very good/ fine/ best/ high/ wonderful/ supreme/ attractive
品质低劣：quality is bad/ inferior/ not good/ poor/ imperfect/ defective/ faulty/ second-rate/ lower/ unsatisfactory
质量保证：retain the good quality; keep up to the standard quality; obtain a good quality; attain1 the best quality; secure an excellent quality
物品以达标准品质：An article is up to the standard quality; An article is of the same quality as the standard; An article is equal to the standard quality; An article is the same as the standard quality
物品在标准以下：An article is below the standard
物品在标准以上：An article is above the standard
物品和样品一致：An article is up to the sample; An article corresponds with the sample; An article is equal to the sample.
average quality 标准品质
We would like to buy 500 tons of average quality corn.
customary quality 一般品质
The quality of the goods shipped is customary quality.
best quality, prime quality, first-rate quality 最好品质
The goods supplied shall only be those of best quality.
quality inspection2 certificate 品质检验证书
Please be sure to attach a quality inspection certificate.
difference in quality 品质上的差异
There is a big difference in quality between the trial order and the order of this time.
guarantee of quality 质量保证
We request a guarantee of quality for a period of one year on all the goods you sell.
sacrifice quality 减少品质
If you sacrifice the quality and deliver goods of imperfect quality to us, we will refuse to accept them.
