a metric unit of length equal to one quadrillionth of a meter
同义词：femtometer??/??femtometre
Italian nuclear physicist (in the United States after 1939) who worked on artificial radioactivity caused by neutron bombardment and who headed the group that in 1942 produced the first controlled nuclear reaction (1901-1954)
同义词：Enrico Fermi
Laura was Jewish. Later the Fermis decided to leave Italy, because the Fascist government had begun oppressing Jews.
VOA : special.2009.06.14
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。