硬膜外的

硬的英语翻译：

firm; forcedly; forcibly; good; hard; rigidity; stiff; strong; tough
【医】 pachy-; scirrho-

膜的英语翻译：

film; membrane; theca; velamen; velum
【化】 membrane
【医】 coat; envelope; film; lemma; membranae membranae; membranae membrane
panniculus; theca; thecae; tunic; tunica; velamen; velamenta
velamentum

外的英语翻译：

besides; in addition; not closely related; other; outer; outside; unofficial
【医】 ec-; ecto-; exo-; extra-; xeno-