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.

对于赫德岛和麦克唐纳群岛与众不同的保护价值在于，该群岛保留了世界罕见的早期岛屿生态系统，它从未受到过来自本生态系统外的生物影响，也没有受到过人类的影响。

youdao

Tides provide energy for the ecosystems, but estuaries are protected from waves and storms by island, mud or sand.

海潮为生态系统提供了能量，河口则由于受到岛屿和泥沙的保护而免遭海浪和风暴的影响。

youdao

Her selective approach also allows her to focus on man's impact on island ecosystems, without getting diverted by the many quirks of island societies or the curious characters that turn up there.

ECONOMIST: Island life

With a firm grasp of science matched by her eagerness to inform, she transforms her other adventures in places like Madagascar, Hawaii and Lombok into diverting lessons in the biodiversity of island ecosystems.

ECONOMIST: Island life

The site, located in the south Atlantic, is one of the least-disrupted island and marine ecosystems in the cool temperate zone.

UNESCO: World Heritage