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chemical sampling
 chemical sampling
oil 化学取样
| system
 system
gen.
IMF. 安排
interntl.trade. 系统分析
met. ; 装置
tech. 制度; 体系; 系统; 方法

to phrases
chemical sampling
oil 化学取样
chemical sampling system
: 4 phrases in 4 subjects
Electronics1
Explosives and Explosive Ordnance Disposal1
Nautical1
Technology1