a patter of footsteps的用法和样例：
- There was a patter of footsteps outside the window, and Mo Kan-cheng burst into the room. "They-they're at it again!" he stuttered.
- They will soon be hearing the patter of tiny feet.
- The sudden sound of footsteps in silence made her blood run cold.
- He heard the scrape of footsteps up the stairs.
- The dog cocked its ears at the sound of footsteps.