The story goes that two friends were walking through the desert. During some point of the journey they had an argument, and one friend slapped the other one in the face.

两个朋友结伴穿越沙漠，旅途中二人突然吵了起来，其中一个掴了对方一记耳光。

The one who got slapped felt hurt, but without saying anything, wrote in the sand: Today my best friend slapped me in the face.

被打的人感到自己受了伤害，但什么也没有说，只是在沙地上写下了这样一句话：今天我最好的朋友掴了我耳光。

They kept on walking until they found an oasis, where they decided to take a bath. The one who had been slapped got stuck in the mire and started drowning, but the friend saved him.

他们继续前行，看见到处绿洲，他们正打算在那里洗澡时，刚才被打的人不小心陷入了泥潭，开始深陷，他的朋友救了他。

After he recovered from the near drowning, he wrote on a stone: quot;Today my best friend saved my life.

等他从几近淹死的边缘苏醒过来后，他在石头上刻下：今天我最好的朋友救了我的命。

The friend who had slapped and saved his best friend asked him, after I hurt you, you wrote in the sand and now you write on a stone. Why?