谢谢大家！我查到一个英文网页，上面有如何搜索掉在地上的东西的规则

https://aphconnectcenter.org/visionaware/living-with-blindness-or-low-vision/getting-around/orientation/searching-for-dropped-objects/#:~:text=When%20searching%20for%20a%20dropped,between%20and%20around%20your%20feet.