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primary(switching) center的英文翻译是什么意思，词典释义与在线翻译：
英英释义
名词 primary:
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a preliminary election where delegates or nominees are chosen
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one of the main flight feathers projecting along the outer edge of a bird's wing
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(astronomy) a celestial body (especially a star) relative to other objects in orbit around it
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coil forming the part of an electrical circuit such that changing current in it induces a current in a neighboring circuit
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of first rank or importance or value; direct and immediate rather than secondary
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not derived from or reducible to something else; basic
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most important element
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of or being the essential or basic part
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of primary importance
