在到这个山洞之前，我爬上过直径有3英尺的石化树干，那树有几百万年的树龄了。
Before reaching the cave, I climbed over a large petrified tree trunk, three feet in diameter, dating back millions of years.
这些木乃伊树有别于石化的树。石化树是一种化石，因其木质在千百年中转化成矿物质而形成。
The mummified trees are different from petrified wood, a kind of fossil created when wood is replaced with minerals over thousands of years.
贝兹说：“你可以在30年之内让一棵树成材。 而石化燃料需要2亿到3亿年的时间才能形成。”
"You can grow a tree in 30 years, versus your fossil fuel which takes two-or-three hundred, million years to form the carbon fuel," says Bates.
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