逐级调节

【化】 step-by-step regulation

逐的英语翻译：

chase; drive out; expel; pursue

级的英语翻译：

class; grade; level; o-level; rank; stage; step
【医】 grade

调节的英语翻译：

adjust; accommodate; measure; regulate; screw; tune up
【计】 conditioning; governing
【化】 adjustment
【医】 a.; Acc.; accommodation; adjustment; control; regulation
【经】 accommodation; co-ordinate; modulation; reconcilement