（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。
Жители Санкт-Петербурга устроили «крысогон»17:52
Long-duration missions in space take a toll on the body, astronauts lose bone density and suffer muscle loss. Blood circulation is also affected, and fluid shifts can also impact eyesight.。业内人士推荐Line官方版本下载作为进阶阅读
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。WPS官方版本下载对此有专业解读
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A letter understood to be from a former employee of Wembley Stadium raised concerns about safety。夫子对此有专业解读