n.
a piece of furniture that provides a place to sleep
"he sat on the edge of the bed"; "the room had only a bed and chair"
a plot of ground in which plants are growing
"the gardener planted a bed of roses"
a depression forming the ground under a body of water
"he searched for treasure on the ocean bed"
同义词：bottom
(geology) a stratum of rock (especially sedimentary rock)
"they found a bed of sandstone"
a stratum of ore or coal thick enough to be mined with profit
"he worked in the coal beds"
同义词：seam
single thickness of usually some homogeneous substance
"slices of hard-boiled egg on a bed of spinach"
同义词：layer
the flat surface of a printing press on which the type form is laid in the last stage of producing a newspaper or magazine or book etc.
a foundation of earth or rock supporting a road or railroad track
"the track bed had washed away"
