一部外国小说描写了这样一则故事:某夜,一名侦探潜入一个公爵的住宅,在三楼卧室里,窃取到一份重要的信件。他正要离开房间,突然听到门外有脚步声——公爵回来了。窗外有一条运河,但不能跳——这样信件会被弄湿。灯光中,他看见助 A foreign novel portrays the story that one night a detective sneaked into a Duke’s residence and stole an important letter in the third-floor bedroom. He was about to leave the room and suddenly heard footsteps outside - the duke was back. There is a canal outside the window, but you can not jump - so the letter gets wet. In the light, he saw help