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semi-active
 semi-active
tech. 半活性的
| tracking system
 tracking system
auto. 追 踪系统
avia. 外测体制
commun. railw. 追踪系统
math. 跟踪系统
space 跟踪 体制

to phrases
semi-active
tech. 半活性的
semi-active tracking system
: 53 phrases in 9 subjects
Air defense5
Automobiles1
Aviation10
Electronics9
General1
Rail transport1
Securities1
Space18
Technology7