Because of support directional situation of barrel recoil and counter-recoil is different, so influence on gun fire dispersion is different.
由于身管后坐复进运动中支撑定向情况的不同，对火炮的射击密集度产生的影响也不相同。
When triggered by the building's fire alarm control panel, it alerts building occupants to the location of the nearest exit using directional sound.
当大厦的火警警报控制面板被触发，该扬声器会使用定向声音引导住户到最近的出口。
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