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

Flat-bottomed \Flat"-bot`tomed\, a.
   Having an even lower surface or bottom; as, a flat-bottomed
   boat.

资料来源 : WordNet®

flat-bottomed
     adj : having a flat bottom; "a flat-bottomed boat" [syn: {flat-bottom}]