When an arm is amputated, or a leg is amputated, for gangrene, or you lose it in war -- for example, in the Iraq war, it's now a serious problem -- you continue to vividly feel the presence of that missing arm, and that's called a phantom arm or a phantom leg.
当一条手臂被切除,或一条腿被切除，由于坏疽的原因， 或在在战争中失去，比如在伊拉克战争中， 现在这是一个严重的问题 你依然能强烈地感受到那条已经失去的手臂的存在， 那就称为幻臂或幻腿。