| 单词 | trifocal |
| 释义 | trifocal /truy foh"keuhl, truy"foh'-/, adj. 1. Optics. having three foci. 2. (of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision. n. 3. trifocals, eyeglasses with trifocal lenses. [1945-50; TRI- + FOCAL] |
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