资料来源 : Webster's Revised Unabridged Dictionary (1913)

Landmark \Land"mark`\, n. [AS. landmearc. See {Land}, and {Mark}
   a sign.]
   1. A mark to designate the boundary of land; any, mark or
      fixed object (as a marked tree, a stone, a ditch, or a
      heap of stones) by which the limits of a farm, a town, or
      other portion of territory may be known and preserved.

   2. Any conspicuous object on land that serves as a guide;
      some prominent object, as a hill or steeple.

   {Landmarks of history}, important events by which eras or
      conditions are determined.