求翻译：The injured person was fixing a length of string to a reel using an air powered staple gun when the gun slipped against his other hand and discharged a staple into the back of his hand. He was assessed on site by a first aider and then driven to hospital where he required surgery to remove the staple.是什么意思？

待解决 悬赏分：1 - 离问题结束还有