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The nucleus of the atom is heaviest structure, and it occupies only a fraction of the volume of the atom.
原子核是最重的结构,而它仅仅占据原子体积的一小部分。
youdao
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The nucleus of the atom is heaviest structure, and it occupies only a fraction of the volume of the atom.
原子核是最重的结构,而它仅仅占据原子体积的一小部分。
youdao