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。

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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。

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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。

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Ted Nash chose to express the tragic side of the artist's life with this composition.

VOA: special.2010.03.24

In one gallery, Xiao Yuncong's 1657 "Landscape" with its soothing, simplified forms in blue and green is displayed cater-cornered to Cheng Sui's monochromatic "Tall View of Streams and Mountains, " where short, vertical strokes infuse a monumental composition with a buzzing sense of life.

WSJ: Paths Easy and Daunting | Ming Masterpieces | Artful Recluse | Lacma | Asia Society | By Lee Lawrence

One highlight of the May auctions was the sale of ''Nature Morte au Melon Vert, '' a delicious still-life composition by the painter Paul Cezanne that grabbed the top price at Sotheby's Impressionist and Modern auction.

FORBES: Scintillating Cezanne, Sizzling Season

Perkol-Finkel, a marine biologist, modified the composition, texture, and design of concrete so that it fosters growth of native flora and fauna while increasing the operational life span and stability of the concrete structure.

FORBES: Women Show Construction Industry How to Rebuild Better, Stronger