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frequency angle
 frequency/angle
mil., air.def. 频率与角
| scanning
 scanning
agric. 详查; 细察
met. 观测; 检测; 展开
rem.sens. 扫描
space 全景摄影; 搜索; 巡回检测
| tracking
 tracking
rem.sens. 定位
| and
 and
gen.
| ranging
 ranging
hydroel.st. 测距

to phrases
frequency/angle
mil., air.def. 频率与角
frequency angle scanning tracking and ranging
: 6 phrases in 5 subjects
Air defense2
Electric machinery1
Electronics1
Space1
Technology1