| 词汇 | opacity |
| 词根词缀 | 词源： 1560, "darkness of meaning, obscurity," from Fr. opacité, from L. opacitatem (nom. opacitas) "shade, shadiness," from opacus "shaded, dark, opaque." The lit. sense "condition of being impervious to light" first recorded 1634. |
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