| 单词 | concave |
| 释义 | concave concave adj: (curved inwards) SC 凹的 āo de The lens was concave and about 2 mm thick. concave mirror n: (curves inward) SC 凹透镜 āo tòu jìng TC 凹面鏡 Most large astronomical telescopes use a concave mirror to bring the light to a focus. |
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