Recently, I saw a piece of moving news on the internet. A worker went to a convenience store to buy drink to quench his thirst. Because his boots are muddy, he took off his boots and walked into the store with socks on his feet. If he did not take off his boots, the floor of the store would also be muddy everywhere and clerks had to spend some extra time cleaning the muddy floor. To be a customer, the worker was not obligated to take off his boots. Even though he walked into the store directly with muddy boots, clerks could not blame him for his making the floor muddy. However, he chose to take off his muddy boots voluntarily. I think many people who saw the news would also think him to be a man of real thoughtfulness.