暴风雨导致铁轨松动，致使火车脱轨。

The storm caused the rails to loosen, resulting in the train ___derailing.

她不断改变话题，把讨论从重要议题上岔开了。

She kept changing the subject, ___derailing the discussion from the main issues.

她的突然提问完全打断了我的思路。

Her sudden question completely ___derailed my train of thought.