In terms of wind and raw solar energy, the flow is exceptionally diluted: solar is ten to fifty times less concentrated than fossil fuel.
对风能和其他天然的太阳能来说，能量流异常稀薄的：化石燃料的浓缩度比太阳能高十到五十倍。
2
As much as Americans seem reluctant to give up their petrol-guzzling SUVs, he concentrated on promoting small, fuel-efficient cars, with a similar message around the world to advertise them.