I'm sorry it's always necessary对不起总是必要的

There is one word that is on the lips of Americans，day and night：“Sorry.”
One time as I was walking on the street，a young man ran by hurriedly，brushing against my handbag. Even as he continued on his way，he turned back and said“sorry”to me. Even in a rush，he didn‘t forget to apologize. One day，after I bought a mango，the salesman was giving me the change，but I wasn’t ready for it and a coin dropped to the ground.“I‘m sorry，”he said while bending down to pick it up. I was puzzled—why would he apologize when it is my fault?
Another time，I stepped on a man‘s foot in an escalator，at the same time，we both said“sorry”。I thought it interesting，was it really necessary for him to apologize?Later on，an American friend explained to me that according to the American mentality，the escalators a public place，and everyone should be able to stand in it. After someone occupies a position in the elevator，making it difficult for someone else to find a place to stand，isn’t it necessary to express an apology?
If you go to the movies and the tickets happen to be sold out，the ticket seller will say：“Sorry，the tickets are sold out.”Whenever one of your hopes goes unfulfilled，an American will say“sorry”as a sign of sympathy. During my stay in America，I often came across situations in which I was supposed to say“sorry”。Gradually，I realized that when friction occurs in daily life，Americans don‘t care much about who is responsible;If someone is troubled，a“sorry”is always necessary. When this happens，even if the other person is hurt，the“sorry”cools tempers and human generosity is displayed. Perhaps this is why I never saw anyone quarreling on the buses，subways or streets of America.