noun 下载 🔗分享 放射性, 放射现象 Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus. Examples : "The old watch contained radium, which caused its hands to glow in the dark due to radioactivity. " 这块旧手表里含有镭，镭的放射性使它的指针能在黑暗中发光。 physics energy substance chemistry environment science material 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 放射性， 放射现象 The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc. Examples : "The radioactivity from the old smoke detector is dangerous and should be disposed of properly. " 那个旧烟雾探测器释放的放射性物质很危险，应该妥善处理。 physics energy substance science 与AI对话词汇游戏阅读练习
