a substance that damages the nervous system, especially one used as a weapon 神经毒剂:一种损害神经系统的物质,尤其是用作武器的物质 Chemical weapons, including nerve agents and mustard gas, have been banned under international law since the 1990s. 自20世纪90年代以来,包括神经毒剂和芥子气在内的化学武器已被国际法禁止。