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passive tracking
 passive tracking
avia. 无源跟踪; 被动跟踪
| system
 system
gen.
IMF. 安排
met. ; 装置
tech. 制度; 体系; 系统

to phrases
passive tracking
avia. 无源跟踪; 被动跟踪
space 无源[被动]跟踪
passive tracking system
: 22 phrases in 5 subjects
Air defense5
Aviation3
Electronics6
Space5
Technology3