金钱是万能的吗？(is money all-powerful?)
    as we all know most of the material things in our daily life have to be bought with money. but money is not all powerful. there are many things that money cannot buy, such as time and true love.
    there are 24 hours in a day. sometimes when we are very happy, we all wish the period of happiness would last longer. but how much money we are willing to pay, we cannot make a day last longer than 24 hours. on the other hand, when we are unhappy, money cannot make the unhappy time