translation.en: Fracking came out in '47, and don't believe for a minute when our president gets up there and says the Department of Energy 30 years ago developed fracking.
translation.zh: 水力压裂技术发明在1947年 我真不敢相信 我们的总统到了那儿 说水力压裂技术是在30年前 由能源部发明的