递进

gradual progress / to go forward one stage at a time

to go forward / to advance / to go in / to enter / to put in / to submit / to take in / to admit / (math.) base of a number system / classifier for sections in a building or residential compound

to hand over / to pass on sth / to gradually increase or decrease / progressively

to hand over; to pass on; to deliver / (bound form) progressively; in the proper order