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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. 话说两个好朋友正在穿越一个沙漠。途中他们忽然争吵了起来，其中一个一巴掌扇在另外一个人的脸上。The one who got slapped was hurt, but without saying anything, he wrote in the sand: "Today my best friend slapped me in the face." 被扇的那个人受了伤害，但他一句话也没有说，只是在沙子上写道：“今天我最要好的朋友打了我一个耳光。”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.     他们继续走下去，后来发现了一片绿洲，他们于是决定洗个澡。先前被打的那个人这时不小心陷入了一个泥潭里面，差点被淹死了，幸运的是他的朋友把他给救了出来。After he recovered from the near drowning, he wrote on a stone: "Today my best friend saved my life."     他苏醒过来后，立刻在一块石头上写道：“今天我最要好的朋友救了我一命。”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?"     扇过他耳光又救过他性命的朋友于是问他说：“我打了你之后你在沙子上写字，而现在你却在石头上写，为什么呢？”The other friend replied: "Wh