【电】 aquadag
black lead; graphite; plumbago; pot lead
【化】 black lead; graphite; mineral black; mineral carbon; pot lead
【医】 black leaching; graphite; plumbago
fort; fortress
layer; region; stage; story; stratum; tier
【计】 layer
【医】 coat; lamella; lamellae; lamina; laminae; layer; strata; stratum