| 单词 | visual signal |
| 释义 | visual signal But it was an error not to have a visual signal to the coverage inside. Times, Sunday Times It uses 14 high-speed cameras, with the indication of whether a goal has been scored confirmed within one second by a vibration and visual signal on each match official's watch. Times, Sunday Times Most people are unable to initiate pursuit without a moving visual signal. Retrieved from Wikipedia CC BY-SA 3.0 Many insects can detect polarization of light, so it has been proposed that this feature may be used as a visual signal between moths. Retrieved from Wikipedia CC BY-SA 3.0 Busy ports used a visual signal, the dropping of a ball, to allow mariners to check the chronometers used for navigation. Retrieved from Wikipedia CC BY-SA 3.0 |
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