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double back ['dʌbl'bæk]
gen.	向后折叠; 把…对折; 掉头折回飞跑
auto.	【动】反转; 返回; 向后折叠; 双面的
gymn.	后空翻2周
ski.jump.	后空翻两周
tech.	稀松织物背衬; 双层面层做法; 复式背衬

double back: 55 phrases in 19 subjects

Aviation	1
Bodybuilding	2
Business	1
Dancing	1
Electronics	1
Figure skating	1
General	2
Gymnastics	15
Metallurgy	1
Oil / petroleum	1
Plastics	3
Polygraphy	1
Rugby football	1
Scuba diving	2
Space	1
Technology	4
Textile industry	12
Weightlifting	2
Wrestling	3