Radioactivity such as that of strontium 90 causes health problems in people even at low levels.
像银-90的放射性,哪怕是较低水平的放射性,都会对人体的健康造成危害.
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英英释义
Noun
1. a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones