Early life-forms on Earth were confined to the oceans because water was the only available protection they had against ultraviolet radiation.

地球上早期的生命形式被限制在海洋里，因为水是帮助它们抵御紫外线辐射的唯一有效保护。

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Some environmental protection groups believe that humans will understand the true spirit of Earth Day and try their best to protect the earth.

一些环保组织认为，人类会理解地球日的真正意义，并尽最大努力保护地球。

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We on Earth have protection in the form of a magnetic shield. But that shield is dead on Mars, gone for billions of years.

我们在地球上受磁场的保护，而火星上的磁场早就在亿万年就消失了。

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The final Earth Day themed event took place Sunday. The Environmental Protection Agency, students and other organizations with ideas for a more sustainable future filled large white tents on the mall.

VOA: standard.2010.04.25

But more than just a scientific curiosity, the asteroid resources deposited on the Moon over the past 4 billion years represent an opportunity to harvest those resources in the construction of lunar bases for the benefit and protection of Earth.

FORBES: The Moon is a Natural Platform for Asteroid Mining, Detection and Deflection

The ocean accounts for 70% of the surface of the Earth, but only one percent of their area benefits from protection.

UNESCO: Indigenous Peoples

"The Welsh government must discuss devolution of these controls immediately if we are to have decent protection for Welsh bees, " said Friends of the Earth Cymru director Gareth Clubb.

BBC: Welsh bee decline action plan to promote allotments