However some live or travel through polluted regions with few trees to provide oxygen.
可是一些人旅行经过或居住在极少树木提供氧气的污染地带。
Normally, the blood supply to the placenta increases to provide more oxygen and nutrients.
正常情况下，血液为胎盘的增长提供更多的氧和营养。
Woman: they provide oxygen to breathe. In the face of the earth, and they are as important as the air.
女：它们提供可以呼吸的氧气。在地球上，它们和空气一样重要。
High oxygen content: human cells to provide the necessary oxygen and nutrients to enhance immunity.
高含氧量：提供人体细胞所需氧气和养份，增强免疫力。
High oxygen content: human cells to provide the necessary oxygen and nutrients to enhance immunity.
高含氧量：提供人体细胞所需氧气和养份，增强免疫力。
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