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first coat
archit.	底涂; 头道抹灰涂层
bridg.constr.	打底
cultur.	底涂〔层〕
exhib.	底层涂料
met.	涂底; 上底漆; 底涂层; 涂底漆
oil	底漆; 头道漆
plast.	底漆层
tech.	第一道涂工 (油漆等); 头道灰; 第一度油漆; 底涂 (层); 头道抹灰; 刮糙; 首涂层; 结合层; 抹灰底层; 括糙
textile	预涂层

first coat: 5 phrases in 2 subjects

Electronics	2
Technology	3