单词	Galton whistle
释义	Galton whistle noun : a whistle of variable high pitch used to test the upper limit of audibility Word History Etymology after Sir Francis Galton, its inventor
随便看	Dagestan daggas dagged dagger dagger cocklebur dagger fern dagger moth dagger plank dagger plant dagger rudder daggerboard daggerboardes daggerboards daggerbush daggered daggering daggerlike daggers dagging daggle daggled daggles daggling daggy daghesh

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