[网络] 虚焦距;名义焦距 focal length: 焦点距离; 焦距透镜的; 局部长度focal distance, focal length: 焦距nominal length: 标称长度; 标尺长度nominal focal ratio: 标称焦比; 标称焦距比nominal focal spot value: 焦点标称值下载手机词典可随时随地查词查翻译