The oxygen poor air at great heights causes a person's heart to work extra hard.

高山的缺氧常常会引起人们工作额外的辛苦。

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Air cannot penetrate between the soil particles, making the soil oxygen-poor.

空气不能穿透土壤颗粒，这使得土壤中缺少氧气。

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Massive releases of methane from arctic seafloors could create oxygen-poor dead zones, acidify the seas and disrupt ecosystems in broad parts of the northern oceans, new preliminary analyses suggest.

新近研究的初步分析表明，从北极海床释放的大量甲烷可能造成缺氧死区，海洋酸化并扰乱北部海洋广大地区的生态系统。

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First, they considered the possibility that seasonal upwellings of toxic or oxygen-poor bottom water were responsible.

ECONOMIST: What killed Fossil Lake?

But it concludes that the oil is continuing to break up and disperse underneath the surface, making the emergency of a major oxygen-poor dead zone unlikely.

CNN: No signs of 'dead zone' in Gulf, feds say

The EPA pulled off the feat by sharply increasing the amount of oxygen-poor exhaust that is recirculated into the combustion chamber and increasing the pressure of the fuel being forced into the cylinder.

FORBES: EPA, Inc.