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长期周期
tech. secular cycle; secular period
长期周期
: 151 phrases in 31 subjects
Agriculture10
Architecture1
Aviation8
Bridge construction1
Business4
Chemistry1
Dermatology1
Desert science1
Earth sciences5
Ecology1
Economy4
Electric machinery1
Electronics8
Engineering geology2
Explosives and Explosive Ordnance Disposal1
Finances3
General2
Genetics1
Geophysics1
Heavy equipment vehicles1
Oil / petroleum7
Oil processing plants1
Polymers3
Project management2
Rail transport1
Reproductive biology1
Space15
Sports2
Technology58
Telecommunications1
Textile industry3

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