Officer Stacey was knocked over by a sharp blow to the head.斯泰西军官的头部受到重击，被打倒在地上。He went off to hospital after a blow to the face.他脸部受到重击之后就去了医院。The blow to Sergeant Lewis’ head had knocked him out cold.刘易斯警官的头部受到重击，使他昏迷不醒。He received a heavy blow to the head.他的头部受到重击。