The word "含量" is formed by combining the character "含", which means "to contain" or "to hold", with the character "量", which means "quantity" or "amount". This construction follows a logical semantic blend where "含" conveys the concept of inclusion or possession, and "量" specifies the measurable aspect, resulting in a compound that denotes the "content" or "concentration" of a substance within something else, such as the proportion of an element in a material.