
状态
Courtesy costs nothing. Lower the toilet seat after use. Let the people in the elevator exit before you enter. Return shopping carts to their designated areas. When you borrow something, return it better shape (filled up, cleaned) than when you got it.
If you borrow something, try to return it in better shape than you received it. Clean it, sharpen it, fill it up.
Pros are just amateurs who know how to gracefully recover from their mistakes.