| 释义 | fulcra
  fulcrumrelative position of the fulcrum in three basic types of levers, with arrows indicating the direction of the effort and the downward force of the load ful·crumF0354500 (fo͝ol′krəm, fŭl′-)n. pl. ful·crums or ful·cra (-krə) 1.  The point or support on which a lever pivots.2.  Zoology An anatomical structure that acts as a hinge or a point of support.3.  An agent through which vital powers are exercised.[Latin, bedpost, from fulcīre, to support.]EncyclopediaSeefulcrum
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