Because it was underwater 30 million years ago, the cave is made from limestone composed of fossilized shells, skeletons and coral.
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。
Small leaves happily lying coral reef cave to sleep.
小树叶快乐地躺在珊瑚礁洞里睡大觉。
Small leaves happily lying coral reef cave to sleep.
小树叶快乐地躺在珊瑚礁洞里睡大觉。
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