When one door of happiness closes, another opens; but often we look so long at the closed door that we do not see the one which has opened for us.当一扇幸福之门关闭时，另一扇就会打开。但我们经常过多地盯着那扇关闭的门，而对新开启的门却熟视无睹。——海伦·凯勒