Basic metals, in a broad sense, refer to all metals except precious metals. In a narrow sense, they refer to commonly used metals that are widely used in various aspects of the national economy and society, generally including copper, aluminum, lead, zinc, iron, Manganese, tin, etc. Basic metal trading in the international market is dominated by futures trading, among which copper, aluminum and zinc have large trading volumes. The major exchanges include the London Metal Exchange (LME), the New York Mercantile Exchange (COMEX) and the Shanghai Futures Exchange (SHFE). .