资料来源 : pyDict

航线标识,波线,满潮水位线

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

Seamark \Sea"mark`\, n.
   Any elevated object on land which serves as a guide to
   mariners; a beacon; a landmark visible from the sea, as a
   hill, a tree, a steeple, or the like. --Shak.