a radioactive element的意思|示意

Polonium is a highly radioactive element and a metalloid.

钋是高放射性的元素，金属。

A radioactive transuranic element in the actinide series, artificially produced in trace amounts. Its longest-lived isotope is No255 with a half-life of3 minutes. Atomic number102.

锘在锕类元素中的一种放射性超铀元素，人工微量制造，其最长寿命的同位素是锘255，其。

A radioactive transuranic metallic element produced by bombarding with helium nuclei.

一种放射性超铀元素在用氦核子轰击时发现。

Radium is a radioactive element.

镭是个放射性元素。

It concerns a cat that is sealed inside a box for one hour along with a radioactive element and a vial of deadly poison.

内容是：一只猫被封闭在一个盒子里一个小时，和它一起的还有一些放射性元素和一瓶毒气。

He said detection of the radioactive element caesium outside the No.1 reactor today was "a bad sign" for a core meltdown.

他说今天在第一核电站检测到放射性元素铯，这是核心融化的不好迹象。