Holds water, air and nutrients储存水分、空气和养分 Essential to life on earth对地球生命十分重要 We need to take care of our soil so that it will help us produce the food we need for generations to come我们要珍惜土壤，...
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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。
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