1. A marine bivalve mollusk of the family Pholadidae, having a long shell with which it bores into wood, rock, and clay, often causing destruction of wharf pilings. 
   海笋，穿石贝海笋科中的一种海类甲壳软体动物，有长的甲壳，可以借之伸入到木头、岩石和泥土中，常引起对码头堆放物的破坏
2. rock and rock mass 
   岩石和岩体
3. apparal with shell sets 
   贝珠衣
4. shell dikes in Tianjin 
   天津贝壳堤
5. having a hard shell or shell-like covering. 
   有硬壳或壳状遮盖物。

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• 1. 贝壳岩
  shell-proofstructure避弹结构...shell-rock贝壳岩...shell-slab薄壳板
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