058 你后面的猪 A pig behind you

During the class,a girl sitting behind a boy drew a pig and posted it on his back. The boy quickly found it out and pulled it off. The girl asked him,"How did you know there was a pig behind you"

上课的时候,坐在一个男生后面的女生画了一头猪贴在他的背上。 那个男生很快发现了,把猪拿了下来。那个女生问他:"你怎么知道你的后面有一头猪呢?"