美国商品期货交易委员会（CFTC）：截至5月27日当周，COMEX期铜投机性净多头头寸减少了287手合约，至21,693手合约。

Group 1 - The core point of the article indicates that as of the week ending May 27, the speculative net long positions in COMEX copper decreased by 287 contracts, bringing the total to 21,693 contracts [1]