单词	分阶分层
释义	分阶分层sub-stratification
随便看	visual aid visual aids visual aids for navigation visual aid to navigation visual alignment visual alignment generator visual alignment generator (visalgen) visual alignment generator{=visalgen} visual amnesia visual analysis visual and ocular mobility test visual angel visual angle visual anthropology visual aphasia visual approach visual approach and departure protection area visual approach and landing chart visual approach and landing chart (val) visual approach slope indicator visual-approach slope indicator visual approach slope indicator system visual approach slope indicator system (vasis) visual approach slope indicator (vasi) visual approach slope indicator (vasi) system