The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical composition of Earth's atmosphere.
这个谜题的答案在于早期光合生命形式的新陈代谢活动，这种活动缓慢但一定改变了地球大气的化学成分。
Other factors impacting a planet's climate and suitability for life include its star's age, composition and the size and location of sibling planets in the system.
其他影响行星的气候和适合生命的稳定性的就是它自身的年龄，构成，尺寸以及所在体系邻近星星的位置。
The life cycle of a service starts with the modeling of its requirements, moves through the design and development of the service, which is followed by composition and choreographing of the service.
服务的生命周期是从建立需求模型开始，然后是服务的设计和开发，接着是服务的组合与编排。
"One is not only a little individual, living a little individual life," Lawrence wrote in a letter at the time of the novel's composition.
“一个人并非渺小的一个人，过着微不足道的生活，”在创作小说时，劳伦斯在一封信里写下了上述的话。
Life is every minute of time from the composition.
生命是由每分每秒的时间构成的。
These kinds of? Impurities? The colorful, constitute the world will profusion colorful life composition.
正是这些形形色色的?杂质?，才构成了五彩必缤纷的世界，才组成多姿多彩的生活。
Truth is the most important value of news, the life of news will be threatened and shaken if the deceitful composition invades the body of news life.
真实从来都是新闻的第一生命，一旦虚假的成份侵入新闻的肌体，新闻的生命便会受到威胁乃至遭到动摇。
If students want to write better composition, they must observe life carefully and cultivate habits of accumulating materials.
学生要想写好作文，首先要想做观察生活的有心人，而且观察生活要深入细致，要养成积累素材的习惯。
The theories of the product composition, life cycle and Bostons matrix are followed. Theory study and investigate study are adopted and quantitative analysis is combined with qualitative analysis.
本文遵循产品组合理论、产品生命周期理论及波士顿矩阵理论，采用了理论联系实际、定量分析与定性分析相结合的方法。
The composition of poetry is to use the blood and wisdom of your life, leaving brilliant written words on the road of life.
写作诗歌，是用你生命的血液和智慧，在生命的路途上留下光明的文字！
Please write a composition around 100 words based the topic of "my ideal college life".
请以“我理想的大学生活”为题写一篇100个单词左右的作文。
Deep connotations in the composition of novels come from writer's deep digging in life, careful choice of high grade materials with aesthetic information, and artful treatment of the materials.
小说文本深刻的内涵主要来自于作者对生活的深入发掘，精选品位高、审美信息量大的题材及对题材进行匠心的艺术处理。
Domestic income of running various and management is a important composition of family life.
家庭的多种经营和财产管理活动是家庭生活的重要组成部分。
Results show that the bearing life is closely connected with the composition and appearance of the nickel-barrier layer and diffusion of the elements.
结果表明，轴瓦的寿命与镍栅层的成分，形貌和元素的扩散有着密切的关系。
Still later, he is not only the shape and quite similar to paper-cuts, and the composition is reasonable, prominent theme, as an exquisite works of art, life for the villagers to add a lot of fun.
再后来，他的剪纸不单是形似和神似，而且构图合理、主题突出，成为一件件精致的艺术品，为村民的生活增添许多乐趣。
The large area of the sky in the paintings, the soulful composition, and seemingly simple brushstrokes are in fact expressions of the essence of life that is the pursuit of freedom.
天空在画面中巨大的面积和充满灵性的构成，看似简洁的用笔，其实都在表达人的生命本质乃是追求自由。
Can't it be said that life is actually a symphony, a harmonious composition of gain and loss.
难道不可以说，人生其实就是一曲交响乐，是得与失的和谐组成。
We were required to write a composition of 250 words on "My Home Life", and give definitions and illustrations to twenty phrases.
我们要写一篇二百五十字的作文(我的家庭生活)，并把二十个词语下定义和解释。
Life is a composition of every single day.
生命，是由每一天的生活组成。
Based on the influencing factors on asphalt mixture quality and service life of pavement, the control methods of broken stone diameter, gradation, composition, content of grain less than 0.
针对影响沥青混合料生产质量及沥青路面使用寿命的各种因素，提出对碎石粒径与级配、颗粒组成一致性、粗集料中0。
According to composition and performance of the catalysts, a comprehensive summary about how to prolong the catalyst life was introduced.
结合催化剂的组成和性能就如何延长催化剂的使用寿命做了全面总结。
By changing the composition of powder, the surface layers could be of wearability, corrosion resistance and oxidation resistance, and the boiler's service life is improved.
通过加入不同配比的合金粉末，使工件表面获得高耐磨性、高耐蚀性或耐热抗氧化的保护层，从而提高锅炉的使用寿命。
Therefore, we evaluated the effects of forest loss and landscape composition on the reproductive life-history parameters.
因此，我们估计了森林丧失和景观组成对它们繁殖生活史参数的影响。
The first part describes three phases of his music career, i. e. music composition in his early life, the first and the second turning point in his career.
第一部分包括两个方面，一方面叙述了希曼诺夫斯基的三个音乐创作阶段：早期创作生涯、创作生涯的第一次转折、创作生涯的第二次转折。
These years near-infrared analysis technology is applied widely in life chemistry and medicine and it has become an evaluation tool of body composition.
在生命科学与医药上的应用：近年来近红外光谱分析技术在生命化学和医药领域的应用十分活跃，近红外光谱已经作为人体组成评估的工具。
These years near-infrared analysis technology is applied widely in life chemistry and medicine and it has become an evaluation tool of body composition.
在生命科学与医药上的应用：近年来近红外光谱分析技术在生命化学和医药领域的应用十分活跃，近红外光谱已经作为人体组成评估的工具。
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