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to phrases
arithmetic series
bridg.constr.
算术级数
econ.
等差数列
interntl.trade.
算术数列
math.
等差级数
scient.
算术〔等差〕级数
arithmetic series:
12 phrases
in 6 subjects
Business
1
Construction
1
Economy
4
Electronics
2
Mathematics
1
Technology
3
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