afocal optical system远: far; distant; remote焦: burnt; scorched; charred光学: optics; photology; photics系统: system变焦光学系统: varifocal optical system下载手机词典可随时随地查词查翻译关注微信公众号:chachacidian,回复:远焦光学系统,即可在微信中查询翻译