Other radioactive elements have been discovered since: actinium, radiothorium and mesothorium, ionium, etc.
自那以后发现的其素有:锄、钍和新针、,等等。
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But if all the actinium drugs that are being developed succeed, they're going to need millions of doses, right?
但如果所有正在研发锕都成功了,他们将需要数百万剂,对?
They do this year round and all their work, all their effort produces less than a grain of sand of actinium every year.
他们全年都在进行这项工作,他们所有努力加起来,每年也只能生产不到一粒沙子大小锕。
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