n.平底船，龙骨船（一种河船）； 龙骨式游艇

The keelboat was a common sight on the Mississippi River during the 19th century.
纪时，平底帆船是密西西比河上常见的景象。
Lewis and Clark expedition famously used a keelboat to explore the American West.
刘易斯与克拉克远征队曾使用一艘平底帆船探索美国西部，此事颇为著名。
The keelboat's design allowed it to navigate both shallow waters and strong currents with ease.
平底帆船的设计使得它能轻松地在浅水区和强流中航行。
He learned the art of keelboat handling from his grandfather, who had been a river pilot.
他从祖父那里学到了操控平底帆船的技巧，他的祖父曾是一名河流领航员。
The keelboat served as both a cargo vessel and a temporary home for the crew during long voyages.
在长途航行中，平底帆船既用作货船，也作为船员们的临时住所。
With its large capacity, the keelboat facilitated the transportation of goods and people upstream.
凭借其巨大的载重量，平底帆船促进了货物和人员向上游的运输。
A skilled crew was needed to manage the multiple sails and navigate the keelboat through challenging waters.
需要技术熟练的船员来管理多面帆并驾驶平底帆船穿越复杂的水域。
The construction of keelboats required sturdy wood to withstand the rigors of river travel.
平底帆船的建造需要坚固的木材以承受河流航行的严峻考验。
Keelboats played a crucial role in the expansion of trade and settlement in the early American frontier.
平底帆船在美国边疆早期的贸易扩张和定居中发挥了关键作用。
During races, keelboats demonstrated not only speed but also the teamwork and strategy of their crews.
比赛中，平底帆船不仅展示了速度，还展现了船员们的团队合作和策略。