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级数和
tech.	sum of series
textile	value of series

级数和: 22 phrases in 15 subjects

Agriculture	2
Bridge construction	1
Construction	1
Earth sciences	1
Explosives and Explosive Ordnance Disposal	1
General	1
Geophysics	1
Hydroelectric power stations	1
International trade	1
Mathematics	1
Oil / petroleum	1
Space	1
Technology	6
Telecommunications	1
Textile industry	2