| 字词 | 镭 |
| 释义 | ㄌㄟ一种放射性元素，符号 Ra，银白色，有光泽，质软，能慢慢地蜕变成氦和氡，最后变成铅。医学上用镭来治癌症和皮肤病 radium, a shiny silver-white soft radioactive element that is used in the treatment of certain diseases such as cancer and skin disease and can slowly decay to helium and radon, and finally to lead; symbol: Ra |
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