（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。
If we could simply rewind time and watch the code execute exactly as it did for those failed requests, life would be a lot easier.
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A comparable amount of CO2 can be stored, to the volume of oil and gas that's been extracted, he added, suggesting an operational lifespan for CCS sites of 10 to 30 years.
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