L F-substitution error是什么意思及音标_翻译L F-substitution error的意思_用法？

as weak as a cat是什么意思【铿鸟百科网-英语百科频道】精选as weak as a cat是什么意思、英语单词推荐身体虚弱, 意志薄弱相似短语as weak as a cat身体虚弱, 意志薄弱a weak link薄弱环节a swell cat好家伙to have