demonstrator
n.
1610s, "one who points out," agent noun in Latin form from demonstrate. From 1680s as "one who uses exhibits as a method of teaching;" 1870 as "one who participates in public demonstrations."
| 词汇 | demonstrator |
| 词根词缀 | Online Etymology Dictionary demonstrator n. 1610s, "one who points out," agent noun in Latin form from demonstrate. From 1680s as "one who uses exhibits as a method of teaching;" 1870 as "one who participates in public demonstrations." |
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