| radioactivity | |
| 级别 | 第4级 |
| 音标 | [ ˌreɪdɪəʊæk'tɪvətɪ ] |
| 解释 | n.放射现象，放射性 |
| 英英释义 | the quality that some atoms have of producing energy , which can be very harmful to health |
| 发音 |  |
| 例句 |
1. Radioactivity is a special quality of radium. 放射性是镭的一种特性。 2. The soil contains 30 times the acceptable level of radioactivity. 这片土壤受到了高于标准30倍的辐射。 |
