因为3亿年前山洞是在水底的，山洞总的石灰石里有许多的贝壳，骨骼和珊瑚化石。
Because it was underwater 30 million years ago, the cave is made from limestone composed of fossilized shells, skeletons and coral.
贝壳灰替代石灰用于生产蒸压加气混凝土砌块，具有较好的社会效益和经济效益。
It can bring better social and economic benefit for the production of autoclaved aerated concrete block with the addition of oyster-shell lime.
试验得到贝壳的最大钙利用率可达71%，而石灰石的钙利用率只有43%。
The maximum calcium conversion ratio of shell was about 71% while that of limestone was about 43%.
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