老师与学生在炎热的夏季行经于一个森 林。老师口渴了,吩咐学生去不久前趟过的小 溪取些水来。 学生去了,又空手回来,对老师说:“那些 溪水实在不能喝,有许多车经过,又有一群鸭 子下水,把水弄得污浊不堪,请再往前走吧, 不远处还有河流。” Teachers and students walk through a forest during the hot summer months. The teacher was thirsty and told the students to take some water from the little stream that had been used in the past. The students went and came back empty-handed and said to the teacher: “The rivers can’t drink anymore. There are many cars passing by. A group of ducks go into the water and the water is dirty. Please go ahead and not far away. river.”