以下为句子列表：
英文: In positron emission tomography (PET), a patient is injected with a radioactive element that produces photons, which are sensed slice by slice.
中文: 至于正子断层扫描（PET）的做法，受试者要先注射可产生光子的放射性元素，然后从每个切片中侦测光子的存在。
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英文: It goes without saying that oxygen is the most active element in the atmosphere.
中文: 不言而喻，氧气是大气中最活泼的元素。
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英文: Like Galileo, Cassini is powered by the natural decay of the radioactive element plutonium, which generates heat that is then converted to electricity.
中文: 如同伽利略号，卡西尼号的能源来自放射性元素钸的自然衰变，产生热后再转换成电。
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