matter; substance; material; materialistic; CL:個|个[ge4]

to call into question; to challenge (the truth or validity of)

(physics) mass; quality (i.e. degree of excellence); quality and quantity

essence; nature; innate character; intrinsic quality

character; intrinsic quality (of a person); quality (of a product or service, or as in "quality of life", "air quality" etc)