英语词汇“观察研究”的翻译、意思、用法、释义-英汉汉英双解词典

单词	观察研究
释义	观察研究 observational studyobservational research
随便看	turret floor turret flying gallery turret-front camera turret fuse box turretgraver turret graver turret gun turret gun carriage turret gun mount turret gunner periscope turret gunnery trainer turret guns turret hatch turret-hatch race lock turret-hatch ring turrethead turret head turret-head turret head boring machine turret ice turretice spider turretice steamer turretice taper tool turret illumination turret index