可变聚焦光 focus variable rheostat: 聚焦电位器variable focus condenser: 变焦聚光镜; 可变焦距聚光镜variable focus condensor: 可变焦距聚光器variable focus lens: 变焦距镜头; 变焦透镜; 可变焦距透镜variable focus lenses: 变焦物镜,可变焦距透镜下载手机词典可随时随地查词查翻译