工具变量的美妙之处在于它们让我们以新的视角看世界。
I think we all have a little bit of that rebel in us. It's just a matter of how much you let it out.
我认为我们内心都有点叛逆。只是看你让它释放多少。
Every piece of plastic ever made still exists somewhere on this planet—that's both our challenge and our responsibility.