| 释义 |
氡 Dōng
基本例句
radonnitonRN
锕射气氡的一种放射性的，惰性的和气态的同位素，其半衰期为3。92秒A radioactive, inert, gaseous isotope of radon, with a half-life of3.92 seconds.
射气几种氡的同位素的放射性气体，是放射性物质衰变的产物Any of several radioactive gases that are isotopes ofradonand are products of radioactive decay. |