太阳位于太阳系的中心，也是太阳系中最大的天体。
The sun lies at the heart of the solar system, where it is by far the largest object.
太阳是离地球最近的一颗恒星，也是太阳的中心天体，它的质量占太阳系总质量的99.865%。
The sun is earth's nearest a star, and is also the center of the sun, it accounts for the quality of the celestial 99.865% of total quality of the solar system.
正象太阳是太阳系的中心天体一样，原子核是原子的核心。
Just as the sun is the central body of the solar system, so the nucleus is the core of the atom...
正象太阳是太阳系的中心天体一样，原子核是原子的核心。
Just as the sun is the central body of the solar system, so the nucleus is the core of the atom...
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