actinium的例句
1. All are radioactive and have similar properties to actinium.
这些元素都有放射性，而且性质与锕相似。youdao
2. There are three naturally occurring radioactive series - the thorium series, the actinium series, and the uranium series.
有三个天然存在的放射系列，即钍系、锕系和铀系。youdao
3. There are three naturally occurring radioactive series - the thorium series, the actinium series, and the uranium series.
有三个天然存在的放射系列，即钍系、锕系和铀系。youdao