triggered barrier

例句：

1. 1. The new safety measure is designed to prevent accidents by triggering a barrier when someone steps on the wrong side of the line.
   新安全措施旨在通过在某人踏入错误边线时触发一个屏障来预防事故。
2. 2. The research team found that the triggering mechanism was responsible for the sudden drop in temperature.
   研究小组发现，触发机制是导致温度突然下降的原因。
3. 3. The device's triggering system is incredibly sensitive and can detect even the slightest movement.
   该设备的触发系统非常敏感，可以检测到最微小的动作。