pacer

名词 C2

中文：领跑员、步速员、溜蹄马

One who paces.
In harness racing, a horse with a gait in which the front and back legs on one side take a step together alternating with the legs on the other side; as opposed to a trotter.
A pacemaker (one who sets the pace in a race).
A timer in an electric toothbrush that indicates how long the user should spend brushing in each part of the mouth.

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