昨天，今天， 明天

看过电影"功夫熊猫"后，“为什么熊猫的爸爸是个鸭子？“让孩子们非常困惑。但乌龟师傅的关于昨天，今天和明天的妙语让我回味。从网上找到原诗如下：

The clock is running
Time waits for no man
Yesterday is history
Tomorrow (the Future) is a mystery 
But today is a gift 
That's why it is called the present!