单词：columnar joint
columnar joint的用法和样例：
例句
- They are columnar basalt boulders on Nanding Island.它们就是南碇岛上的玄武岩柱状节理。
- Joint surfaces of the columns do not show slickensides or any evidence of movement.柱状节理面上未见断层擦痕或任何移动的证据。
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