frobn.开关旋钮; 调着玩froadv.来回（现仅用于to and fro短语中）frozen flat fish冻平鱼frozen blue crab冻梭子蟹frozen partridge冻沙半鸡frozen duck feet冻鸭爪frozen sea robin冻红娘鱼frozen pork lung冻猪肺frons of cranium骨性额frozen soil area冻土地区frozen fresh haw速冻山楂Frode Kirkebjerg基凯布耶尔格