In any given year, about a dozen known comets come close to the sun in their orbits, the average person can't see them all, of course.
在任何一年中，大约有十几颗已知的彗星在其轨道中接近太阳。当然，一般人看不到所有的彗星。
Inherent laws between the average binding energy of valence orbits of molecular systems and the catalytic activity of metal oxides are found by analysis.
通过分析，我们发现了分子体系的价层轨道平均结合能与金属氧化物催化活性间的内在规律。
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