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time duration
tech.	历时
telecom.	持续时间

time duration: 30 phrases in 16 subjects

Agriculture	3
Air defense	1
Artificial intelligence	1
Aviation	1
Bridge construction	2
Corporate governance	1
Ecology	1
Electronics	6
Metallurgy	1
Nuclear and fusion power	1
Radio	1
Rail transport	1
Space	3
Technology	4
Telecommunications	2
Wind Energy	1