Take lead, for example: Apart from lead the metal, there are also lead alloys, and more than a hundred inorganic and organic lead compounds. It is this rapidly increasing number of heavy metal compounds and alloys that are incessantly making their way into the sphere of modern living.
例如今天的鉛，除了金屬鉛，尚有合金鉛、無機鉛、有機鉛等一百多種化合物以上，種類日多的重金屬與其化合物，源源不斷的加入了現代生活圈。