| 单词 | trial frame |
| 释义 | > as lemmastrial frame trial frame n. (also trial spectacle frame) an adjustable frame with revolving graduated fittings to hold trial glasses (trial glasses n.). ΚΠ a1884 E. H. Knight Pract. Dict. Mech. Suppl. 903/2 A trial spectacle frame, with double grooves to each eye, graduated to 180°... Used for finding the axis of imperfect vision in astigmatism or cylindrical cornea. < as lemmas |
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