a radioactive element of the actinide series; found in uranium ores
例句
But was pulls out empties entire heart to love your actinium. 而是掏空了整个心在爱你锕。
Did you know that, my Germany wants your happy actinium how diligently. 尓知県知道;峩多麽努力德想要尓开吢锕.
Other radioactive elements have been discovered since: actinium, radiothorium and mesothorium, ionium , etc. 自那以后发现的其他放射性元素有：锄、放射性钍和新针、镍，等等。
Other radioactive elements have been discovered since: actinium,radiothorium and mesothorium,ionium ,etc. 自那以后发现的其他放射性元素有：锄、放射性钍和新针、镍，等等。
Other radioactive elements have been discovered since: actinium, radiothorium and mesothorium, ionium, etc. 自那以后发现的其他放射性元素有：锄、射性钍和新针、，等等。
Either of two decay products of thorium,mesothorium I,an isotope of radium,or mesothorium II,an isotope of actinium. 新钍钍的两种放射性生成物之一，即新钍1号，它是镭的同位素，或新钍2号，它是锕的同位素
