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视觉信号 shìjué xìnhào
avia. visual cue
el. video signal; vision signal
footb. visual sign
tech. optic marking; optical marking; visible signal
wind. visual signal
视觉信号
auto. visual signal
视觉 信 号: 11 phrases in 6 subjects
Aviation1
Electronics2
General1
Nautical5
Space1
Technology1