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primary exposure
 primary exposure
tech. 一次接触
| window
 window
interntl.trade. 橱窗; 业务
IT 视窗
met. 观察孔; 观察窗
space 大气窗; 观测窗
sport. 窗户

to phrases
primary exposure
tech. 一次接触
primary exposure: 5 phrases in 4 subjects
Ecology1
Electronics1
Explosives and Explosive Ordnance Disposal1
Technology2