单词	hydrofoil
释义	hy·dro·foil I. \ˈ ̷ ̷ ̷ ̷+ˌ-\ noun Etymology: hydr- + foil 1. : a flat or curved plane surface designed to obtain reaction upon its surfaces from the water through which it moves  < ships of all sizes may be effectively stabilized against rolling … by the use of controlled hydrofoils — F.D.Braddon > — compare airfoil, hydroplane 2. : an underwater plate or fin attached by struts to a seaplane (where it is retractable) or to a speedboat for lifting the hull clear of the water as speed is increased [hydrofoil 2] II. noun : a boat equipped with hydrofoils
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