user facility用户: user; subscriber; consumer; ...设施: installation; facilities单用户设施: single user facility任选用户设施: optional user facility基本的任选用户设施: essential optional user facility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:用户设施，即可在微信中查询翻译
