frown.劈板斧=froe.froadv.来回（现仅用于to and fro短语中）frozen metal凝固金属frozen bulge冻胀frovatriptan夫罗曲普坦<5-HT1B/1D激动剂； 抗偏头痛药>fronge water油水接触带水frozen noise冻结噪音frozen event冻结事件frozen asset被冻结的资产frozen heavy冻胀froctosamine[医] 果糖胺frozen token冻结标记