At the entrance, they brush past reserve foragers, sending a "go out" signal.
在入口处，它们掠过觅食者，发出“出去”的信号。
2
Mains and external signal cables longer than 10 m shall in areas where lightning is frequent be protected with an external lightning surge protection at the cable entrance to the building.
主线和外部信号线超过10米的，在线进入大楼的入口处时设置避雷保护，避免雷击。
3
The relationship of delay, queue length, signal cycle, vehicle arriving rate and traffic volume in signal intersection entrance lanes is key to urban road traffic micro?