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质心跟踪
 质心跟踪
space centroid tracking
| 干扰
 SA干扰
UN geol. Selective Availability
 干扰
dril. barrage
hydroel.st. interference
IMF. disturbance
met. noise; obstruction
space counter measure
UN econ. disruption

to phrases
质心跟踪
space centroid tracking
质心跟踪
: 4 phrases in 2 subjects
Air defense1
Space3