走进南京金陵中学大门,路旁橱窗里“校园百星”的事迹常常吸引着人们驻足观看。在“十佳科技之星”的行列中,一个圆脸庞的姑娘格外引人注目,她就是本文的主人公于鸣燕。于鸣燕是一个爱思考的姑娘。一次,她在报上读到一个案例,说的是一个窃贼在不破坏门窗结构、不使用钥匙的情况下,只利用一些简单工具,如细铁丝、小铁片就能将门打开作案。鸣燕气愤之余又埋怨起锁来:“这锁也太不起作用了,这不是形同虚设吗?”于是,她把家里所有闲置的锁都找了来,卸了装,装了卸,反复研究锁的结构特征。然 Entering the gates of Nanjing Jinling Middle School, the “campus 100 stars” story in the window beside the road often attracts people to stop and watch. In the ranks of “Top Ten Technology Stars”, a girl with a round face is particularly eye-catching. She is the hero of this article, Yu Mingyan. Yu Mingyan is a girl who loves thinking. Once, she read a case in the newspaper and said that a thief could use only simple tools such as thin wire and small iron to open the door without destroying the structure of the doors and windows and without using the key. In addition to anger, Ming Yan complained about the lock: “This lock is too ineffective. Isn’t this inconceivable?” So she took all the idle locks in her home, unloaded it, loaded it, and repeated it. Study the structural characteristics of the lock. Natural