B:It is estimated that by the end of the decade the cost to the United States petroleum industry(可以放到后面去) of meeting environmental regulations will be ten percent of the price per barrel of refined petroleum.
B:It is estimated that by the end of the decade the cost to the United States petroleum industry(可以放到后面去) of meeting environmental regulations will be ten percent of the price per barrel of refined petroleum.
形式主语结构,不错的啊
by the end of the decades 的意思可以理解 但是 感覺上未必非要用未來式不可 ex.General Motors executives plan to build an electric-hybrid sedan by the end of the decade and sell it at a price similar to competing vehicles.(摘自某網路新聞)