SMM: Shanghai Nonferrous Metal Network; Shanghai metal market; There is a price index below it. SHFE: Shanghai Futures Exchange; Shanghai Futures Exchange; English abbreviation. LME: London Metal Exchange; London metal exchange; LME is the earliest metal trading market, and its popularity is quite high. It can be said that LME has the function of guiding the world metal price, and the registration fee for ordinary members is several hundred dollars/year.