生意的本质就是解决别人的需求！哪里有需求，哪里就有生意，顺便赚点钱！所以，在别人不断抱怨的时候，聪明人会想到机会来了！
The essence of business is to solve the needs of others! Where there is demand, there is business. By the way, make some money! So, when other people constantly complain, smart people will think of opportunities!
