现在，通过检查水的同位素构成，研究人员发现这与第一次给地球带来水的陨石相吻合。
Now, by examining the isotopic composition of that water, researchers have found that it matches that of meteorites, the likes of which also delivered Earth its first drink.
每年应作颈部检查，按常规不需要进行同位素重复扫描。
The neck should be examined yearly. Isotopic scanning is not repeated routinely.
目的：研究宫颈癌放射性同位素肾图（肾图）检查的临床意义。
Objective:To study the clinical significance of radioactive nephrogram in cervical cancer patients.
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