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定期性 dìngqīxìng
hydroel.st. periodicity
定期 〔间发〕性
gen. periodicity
定期 性
: 65 phrases in 19 subjects
Agriculture4
Air defense2
Automobiles3
Bridge construction1
Commerce2
Economy9
Electronics8
Engineering geology1
Finances3
General1
International trade1
Oil / petroleum1
Plastics3
Reproductive biology1
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Space2
Technology19
Telecommunications1
United Nations1