By their very nature, biofuels cannot be carbon-free because carbon is essential to life on Earth.
就生物燃料的性质而言，它还是会产生出碳质物，因为这种碳对地球上的生物是极有必要的。
The stuff is essential to life on Earth, and its peculiar properties mean those hunting aliens think the same will be true elsewhere.
水对地球上的生命体是必不可少的物质，其特殊的性质让寻找外星人的学者认为水在其他地方也是不可或缺的。
The stuff is essential to life on Earth, and its peculiar properties mean those hunting aliens think the same will be true else where.
对地球上的生命体来说，水是必不可少的物质，其特殊的性质让寻找外星人的学者认为这一定律在其他星球也同样适用。
While insects can be easily overlooked, they are nonetheless essential to life on earth, as they decompose nutrients and aerate the soil.
虽然昆虫很容易被忽略，但牠们对地球生活却是非常重要的，因为牠们分解养分和翻松土壤。
She gives life to all the living things on the earth and provides us with air, food, water and other essential things we need for living.
她给了地球上所有生物生命，给我们提供生活所必需的空气、食物、水和一切基本的需要。
A meteorite found in Antarctica adds extra impact to the theory that the essential building blocks of life on Earth came from outer space, say scientists.
南极洲发现的陨石加上对理论额外的影响，非常重要的地球上的生命的建造模块来自外层空间，科学家说。
Thee atmosphere is a complex, dynamic natural gaseous system that is essential to support life on planet Earth.
大气是一个复杂的、动态的天然气体系统，以支持地球上的生命是至关重要的。
While water is essential to all life on earth, it is also the most mindlessly wasted resource.
水是地球生命的本质，水也是最容易被浪费的资源。
The findings may lead scientists to rethink some of their theories about where comets come from and their role in providing some of the essential ingredients for life on Earth.
这些发现或许会使科学家们重新思考他们的某些关于慧星来自何处、它们在为地球上的生命提供必不可少的物质时所扮演的角色等推测。
WCS is committed to this work because we believe it essential to the integrity of life on Earth.
野生动植物保护协会正在致力于这方面的工作，因为我们相信它的完整性至关重要地球上的生命。
WCS is committed to this work because we believe it essential to the integrity of life on Earth.
野生动植物保护协会正在致力于这方面的工作，因为我们相信它的完整性至关重要地球上的生命。
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