pacer
n. 步测者；溜蹄的马；定速装置
例句
As I wrote above, your role model ACTS as a pacer.
如我上面所写，你的行为榜样人扮演着领步人的角色。
One day he noticed a crumpled Piper Tri-Pacer at the end of Mr. Cook's grass airstrip.
一天他注意到库克草地跑道的尽头有一架扭曲的Piper Tri-Pacer飞机。
Use ea pacer like a or your finger--as a focal point to draw your eye across the line or down the page.
使用“节奏器”，例如一支笔或手指，以在阅读一行或一页时，形成一种注视焦点。
