Finally, the United States remains seriously concerned that Syria - a signatory but not a party to the BWC - has conducted research and development for an offensive BW program.
最后，美国依然严重关注叙利亚――《生物武器公约》的签署国，但不是缔约国――已经为一项进攻性生物武器方案进行了研究和发展工作。