层层传达

to send down the line

to pile on top of one another / layer; stratum / floor (of a building); story / (math.) sheaf / classifier for layers

layer upon layer

to pass on / to spread / to transmit / to infect / to transfer / to circulate / to conduct (electricity)

biography / historical narrative / commentaries / relay station

to pass on / to convey / to relay / to transmit / transmission

surname Da

to attain / to reach / to amount to / to communicate / eminent