（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。
To fix that, NASA is redefining the Artemis campaign as a step‑by‑step test program. The agency now aims to launch roughly once every 10 months, standardize its rocket configuration, and rebuild in‑house expertise that has withered over time.
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Hurdle Word 4 answerTERRA
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但血缘本身，就能自动生成爱与亲情吗？
But analysis of Cabinet Office documents by the BBC has found government departments spent around £101m from April 2023 to June 2025.，推荐阅读Line官方版本下载获取更多信息