stechannel级: level; rank; grade渠: canal; ditch; channel梯级渠；级渠: stepped channel二级渠道: secondary canal; two-lever channel零级渠道: zero-lever channel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:级渠，即可在微信中查询翻译
