The oxygen activity of converter molten steel directly influences the yield of alloy and quality of steel.

转炉钢水中的氧含量直接影响合金收得率和钢水的质量。

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The eyeball structures might have recorded the history of oxygen activity in the mantle and the Earth's core.

因此，眼球构造可能是外地核向地幔释放氧，下地幔内存在氧元素的历史记录。

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Commander Dylan Schmorrow, a cognitive scientist with the navy, devised a crown of sensors to monitor activity in the brain such as blood flow and oxygen levels.

海军中校迪伦·斯莫罗是一位认知科学家，他设计出一种传感器人造冠，用来监测大脑的一些活动，如血流量和氧含量。

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This involves shining a light into the brain to discern how much activity is there, and examining the corresponding oxygen level.

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To study the neurology of tickling, Dr Blakemore and her team stuck volunteers into a magnetic-resonance-imaging machine (which monitors oxygen flow to the brain, and thus indicates the amount of activity in that organ's various parts).

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By contrast, modest black-hole activity can stir things up and encourage the formation of the kinds of elements (carbon, oxygen and so on) that are essential for life as we know it.

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