一天,一位满脸愁云的少女来到机智豆探长的办公室,对机智豆探长说,在上周二的晚上,她姐姐被泄漏的煤气毒死了。奇怪的是,姐姐的房间不仅窗户关得严严的,连房门上的缝隙也贴上了封条。来调查的刑警认定:别人是不可能从门外面把封条贴在里面的,这些封条只有她自己才能贴。所以,警察认定她姐姐 One day, a sulky girl came to the detective’s office of the wit, and told the inspector Titchie that on the evening of last Tuesday, her sister’s gas was poisoned. Strangely enough, not only was the window of the sister’s room severely closed, but the gap on the door was also affixed with a seal. The investigating criminal police found that it is impossible for others to stick seals inside the door. These seals can only be posted by herself. So, the police found her sister