伦铜5月份累涨将近4.1%，伦铝涨超1.8%，伦锡则跌3%

Group 1 - LME copper closed down by $70, at $9,498 per ton, with a cumulative increase of nearly 4.09% in May [1] - LME aluminum closed down by $6, at $2,444 per ton, with a cumulative increase of over 1.83% in May [1] - LME zinc closed down by $56, at $2,620 per ton, with a cumulative increase of 1.08% in May [1] - LME lead closed down by $5, at $1,958 per ton, remaining flat in May [1] - LME nickel closed down by $139, at $15,237 per ton, with a cumulative decrease of over 1.17% in May [1] - LME tin closed down by $830, at $30,406 per ton, with a cumulative decrease of over 3.00% in May [1] - LME cobalt remained flat, at $33,700 per ton, remaining unchanged in May [1]