At this time her husband left 9 own laboratory work, in which he had been very successful, and 10 with her in her 11 for this unknown radiation. In 1898, they 12 that they believed there was something in nature which 13 radioactivity （放射性）. To this something, still 14 , they gave the name radium（镭）. All this 15 very interesting, but it was against the 16 of some of the scientists of that day. These scientists were very polite 17 the two Curies, but they 18 not believe them. The 19 feeling among them was: “ show us some radium, 20 we will believe you.”