Living in a stable environment without predators has made it possible for olms to have long lives, but the mechanisms underlying their longevity are unknown.
生活在一个没有天敌的环境中是洞螈长寿的原因之一，但其根本的原因还是一个迷。
2
When the project began, the olms were about 10 years old, making them nearly 60 now.
保护工程实施之初，这些洞螈就已经10岁左右了，按照时间推算的话现在几乎60岁了。
3
The olms studied by Voituron’s team are part of a population established 48 years ago to help conserve the rare amphibian, which is found in caves in Croatia and Slovenia.