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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...
youdao
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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...
youdao