goods of poor quality / poor-quality goods

劣质货物

improve the quality of life

改善生活质量

This model is of good / high quality, but it’s too expensive.

这个型号质量好，但太贵。

the quality of honesty

诚实的品性

What qualities does a great person have?

伟人具有什么样的品德？

products of quality

优质产品