你说得很对。转一段报纸旧闻。

Smile! You can pass on happiness

London. When you're smiling, the whole world really does smile with you.

A paper being published Friday in a British medical journal concludes that happiness is contagious - and that people pass on their good cheer even to total strangers.

American researchers who tracked more than 4,700 people in Framingham, Mass., as part of a 20 year heart study also found the transferred happiness is good for up to a year.