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正循环 zhèngxúnhuán
oil direct circulation; normal circulation
space direct cycle
tech. positive cycle
正循环
: 36 phrases in 14 subjects
Aviation3
Bridge construction3
Business1
Commerce1
Desert science1
Drilling1
Earth sciences1
Electronics1
Engineering geology7
Explosives and Explosive Ordnance Disposal2
Mathematics2
Oil / petroleum2
Space3
Technology8

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