point focus system点: drop聚焦: focus; focusing; concentrate系统: system非聚焦系统: afocal聚焦系统: focused system; focusing structure; focusing system; lens 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:点聚焦系统，即可在微信中查询翻译
