[品质优良]：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

　　[品质保证]：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 最佳品质

　　The goods supplied shall only be those of best quality。

　　-quality inspection 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 品质保证

　　We request a guarantee of quality for a period of one year on all the goods you sell。

　　-sacrifice quality 降低品质

　　If you sacrifice the quality and deliver goods of imperfect quality to us， well will refuse acceptance of them。