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视线距离 shìxiàn jùlí
hydroel.st. sighting distance
oil optical range
space line of sight distance; line-of-sight range
tech. horizon range; line-sight distance; optic range; seeing distance
telecom. line-of-sight distance
视线〔光测〕距离
construct. optical range
视线 距 离: 2 phrases in 2 subjects
Technology1
Telecommunications1