causing a strong emotional reaction of fear or worry because someone is made to remember something bad that has happened in the past

For people with PTSD, loud noises can be triggering. 对于患有创伤后应激障碍的人来说，巨大的声响可能触发强烈的情绪反应。

a triggering experience 一段触发强烈情绪反应的经历