单词：graywacke
pebbles sand firmly united together.
graywacke的用法和样例：
词汇搭配
- low-rank graywacke低级杂砂岩
- feldspathic graywacke长石杂砂岩,长石玄武...
- high-rank graywacke长石杂砂岩,高级杂砂...
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