stage internal efficiency级: level; rank; grade内: inner; inside; within效率: productiveness; efficiency; ...内效率: internal efficiency阀点内效率: valve point internal efficiency; valve-point internal efficiency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:级内效率，即可在微信中查询翻译
