平衡弹簧 – English translation

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平衡弹: 59 phrases in 17 subjects

Agriculture	3
Air defense	1
Architecture	1
Automobiles	5
Aviation	1
Bridge construction	3
Compressors	1
Electronics	2
Engineering geology	2
Hydroelectric power stations	2
Metallurgy	14
Nautical	2
Oil / petroleum	1
Polymers	1
Space	1
Technology	18
Textile industry	1