名词中文翻译
中文翻译：放射性半衰期
同义词：
['radioactivity half-life', 'radioactive decay half-life例句：1. The half life of a radioactive substance is the time it takes for half of its atoms to decay.（放射性物质的半衰期是其一半原子衰减所需的时间。）']
例句：
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1. The half life of a radioactive substance is the time it takes for half of its atoms to decay.
放射性物质的半衰期是其一半原子衰减所需的时间。
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2. The half life of uranium-235 is 4.5 billion years.
铀-235的半衰期为45亿年。
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3. The half life of lead is 160,000 years.
铅的半衰期为16万年。