to get rattled by something 紧张（非正式）

英文释义

(INFORMAL) To become confused, fearful, or anxious by something.

例句

The morning before my big speech I was relaxed and confident, but later I got rattled when I could not locate my notes.

早上，我在发表重要演讲之前还很放松和自信，但后来当我找不到我的笔记时，就紧张起来。