| 单词 | optical |
| 释义 | optical [`äp·tǝ·kǝl] OPTICS Pertaining to or utilizing visible or near-visible light; the extreme limits of the optical spectrum are about 100 nanometers (0.1 micrometer or 3 × 1015 hertz) in the far ultraviolet and 30,000 nanometers (30 micrometers or 1013 hertz) in the far infrared. |
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