到那时纯镁可用作燃料(其能量密度大约是氢的十倍)。
The pure magnesium can then be used as a fuel (its energy density is about ten times that of hydrogen).
有趣的是最大的恐龙恰好是最大哺乳动物的十倍，这和不同的能量摄取量相吻合，“她说。”
"It's interesting that the biggest dinosaurs were just about ten times as big as the biggest mammals, just in line with differences in energy requirements," she said.
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。
In terms of wind and raw solar energy, the flow is exceptionally diluted: solar is ten to fifty times less concentrated than fossil fuel.
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