impulse noise signal

例句：

1. 1. She felt a sudden urge to run for the hills.
   她突然感到想要跑进山里。
2. 2.The decision was made impulsively without much thought.
   这个决定是仓促决定的，没有太多思考。
3. 3.He had an impulse to grab her and kiss her passionately.
   他有一种冲动想要抓住她并热烈地吻她。