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Our planet's magnetic field has reversed polarity from time to time throughout its history.
整个地球史上磁极逆转不时发生。
youdao
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LED will not "light" if polarity is reversed.
LED将不是“轻”如果极性逆转。
youdao
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LED will not "light" if polarity is reversed.
LED将不是“轻”如果极性逆转。
youdao