translation.en: Because what seems a simple stalactite here is not made by calcium carbonate, but is made by opal, and one of those stalactites can require tens of millions of years to be formed.
translation.zh: 因为这样一个看起来普通的钟乳石， 不是是由碳酸钙组成的， 而是蛋白石， 而一个这样的钟乳石 需要上千万年的时间才能形成。