pacing

例句：

1. 2.
   时间
2. 3.
   速度
3. 1.She walked slowly down the street, pacing back and forth.
   她慢慢地沿着街道走着，来回踱步。
4. 2. The patient was pacing back and forth in his room, anxious to see a doctor.
   病人在自己的房间里来回踱步，焦急地想见医生。
5. 3.The horse is pacing at a steady pace, matching the rhythm of the music.
   马以稳定的节奏踱步，与音乐的节奏相匹配。