网站首页 汉语 德语 英语
1Chemistry and Physics. An isotope of the radioactive gas radon, of mass number 219, occurring in the actinium decay series.
2Chemistry. Any of the chemical elements of the actinide series.
1920s. From actin- + -on.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。