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Use "flat-bottomed" in a sentence
"They're super-cheap and beautiful, thin and flat-bottomed, with straight sides."
"In addition, six of the service's Disaster Assistance Response Teams, river-rescue units equipped with shallow-draft, flat-bottomed boats, were staging in areas that are expected to be hit by flood waters."
"The flat-bottomed boat, which was only 12 feet wide, was fitted with side wheels and powered by a coal-fired steam engine."