polar ecosystems
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由于科学考察活动日益频繁以及旅游业在南极地区的迅速开展，人类活动对南极陆地生态系统的影响在最近几十年内一直倍受国际社会的关注。
An awareness of human impacts on the Antarctic terrestrial ecosystem has been increasing in the recent decades due especially to the expansion of scientific expeditions and the tourism industry.
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