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单词 magnetic needle
释义

WordReference Random House Unabridged Dictionary of American English © 2024
magnetic needle, 
  1. Electricitya slender magnetized steel rod that, when adjusted to swing in a horizontal plane, as in a compass, indicates the direction of the earth's magnetic fields or the approximate position of north and south.
  • 1840–50

Collins Concise English Dictionary © HarperCollins Publishers::
magnetic needle n
  1. a slender magnetized rod used in certain instruments, such as the magnetic compass, for indicating the direction of a magnetic field
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