塑料的真正成本不在于生产，而在于它的后续处理。

我不在乎你怎么看我，我根本不会想到你。

I think the most important thing is to make sure that the audience is emotionally engaged with the characters.

Economics is the study of how societies use scarce resources to produce valuable goods and services and distribute them among different individuals. If we think about the definitions, we find two key ideas that run through all of economics: