knee jerk reaction
膝反射反應，指沒有經過深思熟慮的即時反應或反應。
口語·描述本能反應
英文釋義
an immediate and automatic response, often without careful thought or consideration
例句
His knee jerk reaction was to say no, but he later reconsidered.
典故來源
源自醫學膝跳反射，指自動反應，引申為未經思考的沖動回應。