frown.劈板斧=froe.
froadv.来回(现仅用于to and fro短语中)
frozen banana脆皮香蕉
frozen course结冰过程
frozen rennet冷冻皱胃
frozen pigeon冻鸽子
frozen culter冻白鱼
frozen rabbit冻兔
frozen speech刻板言语
frosbite race冬季赛艇运动
Fropiolactone丙内酯, β-丙内酯, 培他丙内酯[消毒药]
Frozen-rock冻结岩石