A smile costs nothing but creates much.It enriches those who receive without impoverishiing those who give.It happens in a flash and the memeory of it sometimes lasts forever.

• 微笑投资甚微但获益颇多，它使微笑获得者富有而不会给施与者带来负担。它是瞬间发生的，但是有时会永远难忘。