| 释义 |
1. | 二氧化硅a chemical containing silicon found in sand and in rocks such as quartz , used in making glass and cement |
n. | 1. silicon dioxide found naturally in various crystalline and amorphous forms, e.g. quartz, opal, sand, flint, and agate. 2. a hard white or clear substance that exists in sand and other materials, used for making glass |
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