half-life
noun [ C ] physics specialized uk/ˈhɑːf.laɪf/ us/ˈhæf.laɪf/
(放射性物质的)半衰期
the length of time needed for the radioactivity of a radioactive substance to be reduced by half
江苏热线英汉汉英双解词典包含207361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。