而且，锻炼是最重要的维持减肥效果的因素。

And exercise is the most important factor in maintaining weight loss.

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背景对大部分的组织器官而言，氧是维持生命活动的必需因素。

Background: For the most tissues and organisms, oxygen is necessary factor to maintain vital activities.

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为维持一个稳定的组织，哪些是关键因素？

What are the key factors in maintaining a stable organization?

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它也是红细胞维持健康的必要因素。

It is also necessary for healthy red blood cells.

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它也是红细胞维持健康的必要因素。

It is also necessary for healthy red blood cells.

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