硬的英語翻譯：

firm; forcedly; forcibly; good; hard; rigidity; stiff; strong; tough
【醫(yī)】 pachy-; scirrho-

膜的英語翻譯：

film; membrane; theca; velamen; velum
【化】 membrane
【醫(yī)】 coat; envelope; film; lemma; membranae membranae; membranae membrane
panniculus; theca; thecae; tunic; tunica; velamen; velamenta
velamentum

下的英語翻譯：

below; descend; down; give birth to; give in; go to; leave off; lower; next
take
【醫(yī)】 cata-; hyp-; infra-; kat-; sub-

腔的英語翻譯：

antrum; cavity
【醫(yī)】 cava; cavern; caverna; cavitas; cavitat; cavity; cavum; celio-; chamber
coel-; coelio-; lumen; lumina; space; spatia; spatium