ul upper level protocolulupper level protocol高级: senior; high-ranking; high-l ...别: change协议: agree on服务级别协议: service level agreement多个服务级别协议: sla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:高级别协议，即可在微信中查询翻译
