单词	centreboard
释义	centreboard /ˈsɛntəbɔːd / (US centerboard) noun A pivoted board that can be lowered through the keel of a sailing boat to reduce sideways movement.The keel is a centreboard but not weighted; the ballast is in the hull itself (which sounds inefficient but actually works surprisingly well).... As a teenager in 1944, I was the skipper of a 10-foot rowboat with a centerboard and small sail. In about 1968, the flat plate centerboard was replaced with an airfoil-shaped centerboard and the mast height was raised slightly, resulting in approximately 20 square feet more sail area.
随便看	air park air passage airphone air pillow air pipe air piracy air pirate air pistol air-pit airplane airplane food air plant airplay air plot air pocket Airpoints air-poise air pollutant air pollution air pore airport airport art airport tax air position airpot

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