这个词是什么意思？
Thorium oxide (ThO2). A radiographic contrast agent that was used in the early 1930s through about 1954. High rates of mortality have been linked to its use and it has been shown to cause liver cancer.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D013911 · MeSH 2026。
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