经典英语美文 （85）快乐之门
Happiness is like a pebble dropped into a pool to set in motion an ever-widening circle of ripples.As Stevenson has said, being happy is a duty. There is no exact definition of the word happiness. Happy people are happy for all sorts of reasons.The key is not wealth or physical well-being, since we find beggars, invalids and so called failures who are extremely happy. Being ...