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polar(ity) relay的英文翻譯是什么意思，詞典釋義與在線(xiàn)翻譯：
英英釋義
形容詞 polar:
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having a pair of equal and opposite charges
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characterized by opposite extremes; completely opposed
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located at or near or coming from the earth's poles
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of or existing at or near a geographical pole or within the Arctic or Antarctic Circles
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extremely cold
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being of crucial importance- Henry Kissinger
