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Just under 27% of the rest of the energy density of the universe is made up of what we call dark matter.
其他近27%的宇宙能量密度是由暗物质构成的。
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The remaining 68% of the energy density of the universe is made up of dark energy, which is even more mysterious than dark matter.
剩余68%的宇宙能量密度来自于暗能量，这种物质比暗物质更加神秘。
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Even though we see them all around us, the total energy density of these components is actually very small, around 5% of the total energy of the universe.
尽管它们就在我们的周围，但这些组成部分的总能量密度却十分渺小，它们仅占整个宇宙总能量的5%左右。
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That means it has the strange property that it expands as the volume of space increases to keep its energy density constant.
那意味着暗能量具有一种特殊属性，它能够使暗能量随着宇宙体积的增长而扩大，从而使其能量密度保持不变。
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双语例句
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Fat is high in energy density.
脂肪能量密度高。
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The keys to energy density and weight loss.
运用能量密度减肥的关键。
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Like fats, sweets are typically high in energy density.
和脂肪一样，甜食也是典型的高能量密度食品。
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A further advantage is the high energy density of the tides.
另一项优势是潮汐的高能量密度。
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Low energy density means there are few calories in a lot of food.
而低能量密度意味着食物量虽大卡路里含量却很低。
百科
1. 能量密度是指单位体积内包含的能量，单位为焦耳/立方米、千焦/立方米、兆焦/立方米，量纲为M(L^-1)(T^-2)。 电池能量密度是指电池的平均单位体积或质量所释放出的电能。食品能量密度是指每克食物所含的能量。