单词	radioactinium
释义	radioactinium noun ra·​dio·​actinium "+ : the radioactive isotope of thorium of mass number 227 formed by disintegration of actinium —symbol RdAc or Th227 see actinium series Word History Etymology New Latin, from radio- + actinium
随便看	ubiquities Ubiquitism ubiquitous ubiquitously ubiquitousness ubiquitousnesses ubiquity ubuntus ubussu ubussu palm ubykhs UC Uca ucae ucas Ucayali Uccello Uccle uces Uchatius bronze uchatius metal Uchean Uchee uchee uchees

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。