The distinctive conservation value of Heard and McDonald – one of the world's rare pristine island ecosystems – lies in the complete absence of alien plants and animals, as well as human impact.
2
十年前，这座岛屿的生态系统陷入混乱。
A decade ago, this island's ecosystem was in chaos.
3
当不同的生态系统出现时，我们可以这样解释：不同的生态系统形成的部分原因是岛屿形成过程的结果。
When varied ecosystems are present, they can be explained as resulting in part from the process that formed the islands.
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