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emergency valve
auto.	应急安全，保险阀
el.	事故紧急阀
hydroel.st.	事故阀
met.	应急活门; 应急阀
tech.	紧急备用阀; 应急动阀; 安全排气阀; 备用阀
wind.	安全阀; 紧急阀

emergency valve: 84 phrases in 17 subjects

Automobiles	4
Aviation	5
Business	1
Chemistry	1
Compressors	1
Drilling	1
Electric machinery	2
Electronics	8
General	1
Mining	3
Nautical	4
Navigation	2
Oil / petroleum	5
Rail transport	6
Shipbuilding	1
Space	5
Technology	34