经济学：供给与需求。

Economics: Supply and demand.

youdao

就连DIY经济学也会告诉你，有需求就有供给。

As even DIY economics will tell you, where there is demand there will be supply.

youdao

就连DIY经济学也会告诉你，有需求就有供给。

As even DIY economics will tell you, where there is demand there will be supply.

youdao