radioactivity [ˌreɪdɪəʊæk'tɪvətɪ]以下由轻松背单词网站提供
单词级别第4级基本释义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参考例句Radioactivity is a special quality of radium. 放射性是镭的一种特性。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。 推荐阅读 |