| 单词 | mouth-board |
| 释义 | > as lemmasmouth-board mouth-board n. rare a wooden instrument to which the mouth is applied, in order to secure a constant position of the head for observation, etc. ΚΠ 1901 E. B. Titchener Exper. Psychol. I. ii. 245 Materials.—Head-rest, with mouth-board and sighting mark. < as lemmas |
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