它是个裸电子，是钠正离子。

It is a naked electron and is a sodium positive ion.

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固定在固体中的正离子和负离子不导电。

Positive and negative ions fixed in a solid do not conduct a current.

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溶液中的正离子和负离子可以移动并且导电。

Positive and negative ions in a solution can move and conduct a current .

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溶液中的正离子和负离子可以移动并且导电。

Positive and negative ions in a solution can move and conduct a current .

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