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second moment
busin.	二阶矩; 二阶动差
econ.	第二势差
math.	二次〔二阶〕矩
polym.	次级矩
sport., med.	二次矩

second moment : 58 phrases in 18 subjects

Artificial intelligence	1
Automobiles	2
Aviation	3
Bridge construction	8
Business	2
Chemistry	3
Construction	1
Earth sciences	6
General	1
Hydroelectric power stations	4
Physics	2
Plastics	1
Polymers	4
Rail transport	2
Space	3
Sports	1
Technology	13
Textile industry	1