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The absence of an oxygen atmosphere on Mars and other planets in our solar system means that these planets also lack an ozone shield that would protect surface-dwelling life from UV radiation.

在火星和我们太阳系的其他行星上没有氧气，这意味着这些行星也缺乏保护地表生物免受紫外线辐射的臭氧层。

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Rainforests have their own perfect system for ensuring their own survival; the tall trees make a canopy of branches and leaves which protect themselves, smaller plants, and the forest animals from heavy rain, intense dry heat from the sun and strong winds.

雨林有自己完善的系统来确保自身的生存；高大的树木有枝叶形成的树冠层来保护自身，树冠也保护着矮小的植物以及动物不受暴雨、酷暑及强风的侵扰。

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But the poorly designed protection system was widely known to be too weak to protect against a major hurricane.

VOA: special.2010.01.22

How do you engineer what happens in our immune system in order to protect us from diseases?

我们如何将免疫功能工程化,保护我们远离疾病

耶鲁公开课 - 生物医学工程探索课程节选

Learning how to turn on your immune system to protect you from a specific pathogen turns out to be very particular to that pathogen.

它发动你的免疫系统来保护你,免受某种病原体的侵袭,只是针对这种特定病原体

耶鲁公开课 - 生物医学工程探索课程节选

The Big Three automakers agreed to the system to protect union workers from outsourcing and technology.

NPR: Idled Auto Workers Tap the Jobs Bank

No wonder, then, that victims have little confidence in the criminal-justice system to protect them.

ECONOMIST: The internet allows the malicious to menace their victims

And do we really need to remake our entire health-care system to protect the uninsured?

WSJ: What Do We Really Know About the Uninsured?