在过去八年中,太阳能电池板的成本下降了80%,风力涡轮机的成本下降了近三分之一。
She was the fourth journalist Novaya Gazeta had lost in the past eight years.她是《新闻报》过去八年内失去的第四位记者。
The number of ethanol factories has almost tripled in the past eight years from 50 to about 140.过去八年间,全美的乙醇工厂从五十家增加到了一百四十家,几乎增加到了三倍。