層層on a level-by-level basis;at each level
～包圍surround ring upon ring/～報批pass a report from one level of authority to another for approval/～加碼increase the quotas at each level /～落實生產(chǎn)安全責任制度implement a workplace safety responsibility system on a level-by-level basis/～轉(zhuǎn)包和違法分包multi-level contracting and illegal sub-contracting |