美国商品期货交易委员会（CFTC）：截至4月22日当周，COMEX铜期货净多头头寸增加2,094手至16,588手合约。

Group 1 - The core point of the article is that the net long positions in COMEX copper futures have increased, indicating a bullish sentiment among investors [1] Group 2 - As of the week ending April 22, the net long positions rose by 2,094 contracts to a total of 16,588 contracts [1]