单词	refractory--period
释义	period，refractory不应期
随便看	underwater observation boat underwater observation tower underwater obstacle underwater ocean current plants underwater oil storage tank underwater operating machine underwater operation ship underwater optical communication underwater optical fiber system underwater ordance underwater ordnance research boat underwater penetration under water photogrammetry underwater photogrammetry underwater photography underwater photometer underwater pipeline underwater position fixing underwater power generator underwater projector underwater protection underwater pump underwater radiance meter underwater reactor underwater recovery vehicle