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to phrases
reciprocal theory
bridg.constr.
互等理论
construct.
可逆〔互易〕定理
;
倒易理论
met.
可逆定理
;
互易定理
tech.
互易理论
;
互换理论
reciprocal theory:
6 phrases
in 3 subjects
Bridge construction
2
Finances
3
Technology
1
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