单词	line of force
释义	line of force noun phrase : a line in a field of force (such as a magnetic or electric field) whose tangent at any point gives the direction of the field at that point Word History First Known Use 1837, in the meaning defined above
随便看	derision derisions derisive derisively derisiveness derisivenesses derisory deriv derivability derivable derivate derivates derivation derivational derivationally derivationist derivationists derivations derivatist derivative derivative citizenship derivative deposit derivative hybrid derivative of a function derivatively

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