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试验，试探
math.	trial; experiment

试验，试探: 114 phrases in 25 subjects

Agriculture	1
Animal husbandry	1
Automobiles	2
Aviation	3
Bridge construction	7
Business	3
Chemistry	2
Compressors	1
Earth sciences	4
Electric machinery	2
Electronics	3
Engineering geology	18
General	1
Hydroelectric power stations	4
Metallurgy	3
Nautical	1
Nuclear physics	1
Oil / petroleum	2
Plastics	1
Rail transport	1
Shipbuilding	9
Space	5
Technology	36
Textile industry	1
Wind Energy	2