In larger stars, pressure at the core is high enough to fuse heavier elements such as oxygen and carbon, creating more photons.

对于更大的恒星，核心的压力大得足以使更重元素进行聚变反应，比如氧和碳元素，它们将创造更多的光子。

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A third is certain basic chemicals such as carbon, oxygen and nitrogen.

第三种是某些基本的化学物质，如碳、氧和氮。

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Under the atmosphere, scientists think there is a very thin crust of carbon and oxygen.

科学家们认为在大气层下存在着一层由碳和氧组成的稀薄地壳。

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Doctors say that over time the damage interferes with the natural exchange of oxygen and carbon dioxide in the lungs.

VOA: special.2010.06.23

Doctors say the damage brought on by these conditions eventually interrupts the natural exchange of oxygen and carbon dioxide in the lungs.

VOA: standard.2010.06.21

These plastics not only serve as superior barriers to the flow of oxygen and carbon dioxide, keeping all kinds of products fresher longer, but also block out smells and prevent the packaging from absorbing any of the flavor or vitamin content of the food.

FORBES: Safer And Guilt-Free Nano Foods

Other values recorded include ammonia, chlorine, water hardness (calcium and magnesium), dissolved oxygen and organic carbon.

BBC: Thames archive reveals long nitrate rise

It is based on indirect calorimetry, which determines energy expenditure of a person by measuring both consumed oxygen and produced carbon dioxide rates.

FORBES: Calories�Cthe ubiquitous term in health and fitness.