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.
2
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...
点击反馈