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free period
ed. 固有〔自由振荡〕周期
fin. 宽限期
interntl.trade. 免税期间
oil 自由振荡周期
tech. 自由周期; 自然周期; 免费期间
free period: 39 phrases in 15 subjects
Agriculture1
Bridge construction1
Business1
Commerce1
Dermatology1
Desert science1
Electric machinery1
Hydroelectric power stations5
Logistics1
Metallurgy1
Oil / petroleum4
Securities1
Space1
Technology18
Wind Energy1