All of us have read thrilling stories in which the hero had only a limited and specified time to live. Sometimes it was as long as a year, sometimes as short as 24 hours.互帮互助He replies: When someone hurts us we should write it down in the sand, the winds of forgiveness can erase it away. But when someone does something good for us, we must engrave it in a stone，therefore，no wind can ever erase it.名著节选The story goes that two friends are walking through the desert. During some point of the journey they have an argument, and one friend slap the other one in the face.沙子与石头
