When we burn the tree we can never get back more energy than its growing leaves had received and stored up from the solar rays.

我们燃烧树木时，所取回的能量绝不会比它生长着的叶子从太阳光中所吸收和贮存的能量多。

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Only about the size of our solar system, quasars easily outshine entire galaxies and can burn for 100 million years.

只关心我们的太阳系的大小，类星体容易一枝独秀整个星系和可刻录为1.00亿年。

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