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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Researchers' clues to the Eemian climate come from measurements of the ratios of two slightly different types of oxygen, isotopes oxygen-16 and oxygen-18, preserved in the GRIP core.

研究人员对间冰期气候的线索来自保存在 GRIP 冰芯中的两种略微不同类型的氧——即同位素氧-16和氧-18的比率。

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How to control the downhole tool's neutron tube from the surface is a complex problem in the pulse neutron oxygen activation logging tool, which measures through a single core cable.

在单芯电缆测量的脉冲中子氧活化仪器中，如何从地面实现对井下中子管的控制是一个非常复杂的问题。

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