商品在贸易上的品质决定方法有：凭样品买卖，凭标准买卖，凭规格买卖等等。

下面我们一起来看看有关品质的表达法：

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.

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