An electric current can consist of charges that are positive, negative, or both.

电流中可能包含正电荷、负电荷，或两种电荷同时存在。

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Conventionally, the direction of electric current is that of the flow of the positive ions.

为了表示电流总的作用，通常取正载荷子的流动方向为电流方向。

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There are two kinds of electric charges: positive and negative.

电荷有两种：正电荷和负电荷。

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There are two kinds of electric charges: positive and negative.

电荷有两种：正电荷和负电荷。

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