im-,进入，使，pulse,冲击，震动。

1. All day she had fought off the impulse to telephone Harry.

她一整天都在克制自己想给哈里打电话的冲动。

2. Sean's a fast thinker, and he acts on impulse.

肖恩是个思维敏捷、行事随兴的人。

3. After lunch she decided on impulse to take a bath.

午饭后她突然兴起，决定洗个澡。

4. Many people act on impulse without counting the cost.

很多人不考虑后果就莽撞行事。

5. He finally gave way to an impulse and pulled her toward him.

他最终还是没能抑制住冲动，把她拉向了自己。