但现在还有一个问题：在寒冷的冬天，我们需要太阳为我们提供额外的热量。
But here's the problem: On a cold winter day, that extra heat from sun would be helpful.
我相信我们需要更多的风能和太阳能，甚至是潮汐能。
I believe that we need more wind and solar and maybe even wave.
为了比较陨石和太阳的成分，我们需要利用元素的比率，而不单单是原子的丰度。
To compare the compositions of a meteorite and the Sun, it is necessary that we use ratios of elements rather than simply the abundances of atoms.
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