visual signal造句

1、a visual signal to control the flow of traffic at intersections.
十字路口控制交通的可见信号。

2、a visual signal to control the flow of traffic at intersections
十字路口控制交通的可见信号。

3、Another visual signal produced by while-tailed deer is termed a buck scrape.
另一种由尾鹿产生的视觉信号被称为擦鹿信号。

4、If a whistle is not available, use the visual signal alone.
如果无口哨的话，只使用可视信号。

visual signal翻译