tracer
n.
c.1500, "one who tracks or searches," agent noun from verb form of trace, n.1. Meaning "bullet whose course is made visible" is from 1910.
| 词汇 | tracer | 
| 词根词缀 | Online Etymology Dictionary tracer n. c.1500, "one who tracks or searches," agent noun from verb form of trace, n.1. Meaning "bullet whose course is made visible" is from 1910. | 
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