英译中题目如下How is PO4 like a molecule?How is PO4 like an ion?

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英译中题目如下
How is PO4 like a molecule?
How is PO4 like an ion?

这个我也不能准确翻译过来
不过a molecule是分子的意思,PO4好像是磷酸的意思
an ion是离子的意思
反正是化学中关于分子离子的问题

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