记住，产生电力的正负电荷是能相互抵消并消失的。(形容词作同位语。)
You remember, that electric charges, positive and negative, which are responsible for electrical forces, can wipe one another out and disappear.
记住，产生电力的正负电荷是能相互抵消并消失的。(形容词作同位语。)
You remember, that electric charges, positive and negative, which are responsible for electrical forces, can wipe one another out and disappear.
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