chargometer

例句：

1. 1. I use a chargometer to track my daily steps.
   我使用一个计步器来追踪我的每日步数。
2. 2. The chargometer showed me that I had walked 5 kilometers last night.
   这个计步器显示我昨晚走了5公里。
3. 3. She bought a new chargometer for her birthday.
   她为了生日买了一个新的计步器。