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four-section
 four-section
gen. 四段式的; 四构件的
| mandrel
 mandrel
met. 芯棒; 顶杆; 卷筒
oil 工作筒
space 模心; 芯子; 紧轴

to phrases
four-section [ˌfɔː'sεkʃn, ˌfɔːr-]
gen. 四段式的; 四构件的
four-section: 15 phrases in 9 subjects
Agriculture1
Communications1
Ecology1
Electronics1
Explosives and Explosive Ordnance Disposal1
Metallurgy6
Steel production1
Technology2
Textile industry1