山洪暴发,洪水紧贴着独木桥流过,不时有浪花溅到桥面上。有好心人在两岸连起一条绳索,横空挂在独木桥上方。这时候有四个人来到岸边:一个盲人,一个聋哑人和两个健康人。他们都有急事要到对岸去。聋哑人不言不语,摇摇晃晃中到了对岸。一个健康人引导着盲人,小心翼翼地安全过了桥。剩下一个健康人松了一口气,面对汹涌的河水,踏上了独木桥,却不幸中途滑落水中。人们感到奇怪:为什么盲人和聋哑人都能顺利过桥,而那个耳聪目明的健康人却落水了呢? Flash floods, floods close to the single-wooden bridge flows, splashing from time to time on the bridge deck. A good man in the two sides linked a rope, hanging across the top of the single wooden bridge. At this time four people came to the shore: a blind person, a deaf person and two healthy people. They are in a hurry to go to the other side. Deaf people silent, staggering to the other side. A healthy person guides the blind and cautiously crosses the bridge. The rest of a healthy person took a sigh of relief in the face of turbulent rivers, embarked on a single-plank bridge, but unfortunately midway down into the water. People are surprised: why blind and deaf mute people can successfully cross the bridge, and that the healthy people who have heard the truth but fell into it?