A boulder is a large piece of rock, typically one that has been worn smooth by erosion.
boulder n. "卵石，圆石" "巨砾，冰砾" "漂砾"
| 单词 | boulder |
|---|---|
| 音标 | [ˈbəʊldə(r)] [ˈboʊldə(r)] |
| 释义 | n.["卵石，圆石","巨砾，冰砾","漂砾"] |
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