交換 Exchange

這終究是一個以物易物的時代，

This time is still for exchange.

有人用青春換金錢，

Someone exchanges coin for youth.

有人用金錢換陪伴，

Someone exchanges accompanying for coin.

有人用陪伴換青春。

Someone exchanges youth for accompanying. 

在交換的過程中產生的副產品叫快樂，

The byproduct in the process of exchange is called happy.

因為摸不著看不到，

Since it couldn't be seen and touched,

不能秤斤秤兩的賣，

so can't be sold.

所以就用送的，

It just might be gifts.

但送多了只是讓交易的價值被低估了。

But if you give too much, the transactions will be undervalued.