商品品量决定交易素质上的价值，因而它是最重要的交易因素之一。
商业上的品量决定办法有：凭样品买卖，凭尺度买卖，凭规格买卖等。下面我们来看看品量的表达发。
[品量优良]：quality is excellent/ superior/ very good/ fine/ best/ high/ wonderful/ supreme/ attractive
[品量差劲]：quality is bad/ inferior/ not good/ poor/ imperfect/ defective/ faulty/ second-rate/ lower/ unsatisfactory
[品量包管]：retain the good quality; keep up to the standard quality; obtain a good quality; attain the best quality; secure an excellent quality
[物品以达尺度品量]：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
[物品在尺度以下]：An article is below the standard
[物品在尺度以上]：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 尺度品量
We would like to buy 500 tons of average quality corn。
-customary quality 一般品量
The quality of the goods shipped is customary quality。
-best quality, prime quality, first-rate quality 更佳品量
The goods supplied shall only be those of best quality。
-quality inspection certificate 品量查验证书
Please be sure to attach a quality inspection certificate。
-difference in quality 品量上的差别
There is a big difference in quality between the trial order and the order of this time。
-guarantee of quality 品量包管
We request a guarantee of quality for a period of one year on all the goods you sell。
-sacrifice quality 降低品量
If you sacrifice the quality and deliver goods of imperfect quality to us, well will refuse acceptance of them。