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竖井井筒内的断绳防坠器 fángzhuìqì
gen. parachute
竖井筒内的防坠器 fángzhuìqì
archit. parachute
防坠器 fángzhuìqì
railw. falling protector
防 坠器
: 11 phrases in 3 subjects
Architecture2
Metallurgy1
Technology8