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base period
bridg.constr.	基本周期
interntl.trade.	基期、基准期间
math.	基期
plann.	基准期间
proj.manag.	评税基期
securit.	基本时期
stat.	基准期
tech.	地下径流时期

base period: 30 phrases in 9 subjects

Business	12
Commerce	1
Economy	5
Finances	2
International trade	1
Project management	1
Securities	1
Statistics	2
Technology	5