A "tracer" is a person or device that follows or marks a course or path.
n. 追踪者，描图者，（铁笔等）绘图工具
| 单词 | tracer |
|---|---|
| 音标 | [ˈtreɪsə(r)] ['treɪsər] |
| 释义 | n.["追踪者，描图者，（铁笔等）绘图工具"] |
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