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单词
half-life
释义
n time taken for the radioactivity of a substanceto fall to half its original value 半衰期（某物质的放射性元素由原有量衰减到一半所需的时间）.
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英汉词典包含54938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。
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更新时间：2025/4/22 14:33:44