商品品質決定交易本質上的價值，因此它是最重要的交易因素之一。
　　貿易上的品質決定方法有：憑樣品買賣，憑標準買賣，憑規格買賣等。下面我們來看看品質的表達發。
　　[品質優良]：quality is excellent/ superior/ very good/ fine/ best/ high/ wonderful/ supreme/ attractive
　　[品質低劣]：quality is bad/ inferior/ not good/ poor/ imperfect/ defective/ faulty/ second-rate/ lower/ unsatisfactory
　　[品質保證]：retain the good quality; keep up to the standard quality; obtain a good quality; attain the best quality; secure an excellent quality
　　[物品以達標準品質]：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
　　[物品在標準以下]：An article is below the standard
　　[物品在標準以上]：An article is above the standard
　　[物品和樣品一致]：An article is up to the sample; An article corresponds with the sample; An article is equal to the sample.
　　-average quality 標準品質
　　We would like to buy 500 tons of average quality corn.
　　-customary quality 一般品質
　　The quality of the goods shipped is customary quality.
　　-best quality, prime quality, first-rate quality 最佳品質
　　The goods supplied shall only be those of best quality.
　　-quality inspection certificate 品質檢驗證書
　　Please be sure to attach a quality inspection certificate.
　　-difference in quality 品質上的差異
　　There is a big difference in quality between the trial order and the order of this time.
　　-guarantee of quality 品質保證
　　We request a guarantee of quality for a period of one year on all the goods you sell.
　　-sacrifice quality 降低品質
　　If you sacrifice the quality and deliver goods of imperfect quality to us, well will refuse acceptance of them.