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Positive and negative ions in a solution can move and conduct a current .
溶液中的正离子和负离子可以移动并且导电。
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Positive and negative ions fixed in a solid do not conduct a current.
固定在固体中的正离子和负离子不导电。
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Positive and negative ions fixed in a solid do not conduct a current.
固定在固体中的正离子和负离子不导电。
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