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周期，时期
math.	period

周期，时期: 107 phrases in 29 subjects

Advertising	1
Agriculture	1
Air defense	2
Animal husbandry	1
Artificial intelligence	2
Automobiles	1
Aviation	8
Bodybuilding	1
Bridge construction	1
Business	3
Commerce	3
Communications	1
Earth sciences	1
Electronics	16
General	3
Genetics	1
Information technology	10
International trade	1
Logistics	1
Metallurgy	3
Oil / petroleum	8
Plastics	4
Project management	1
Space	1
Technology	26
Telecommunications	1
Textile industry	3
Welding	1
Wind Energy	1