money doesn't grow on trees(金錢得來不易)

    Example:

1. Every time, I asked my parents for pocket money, I'd get lecture about           how money doesn't grow on trees.

2. When I want to buy something, I usually think" money doesn't grow on         trees" , so I'm good at saving money.

3. " Money doesn't grow on trees" , Yes, we should spend money wisely.             After all it's hard to get.