（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。
Remove "Sellfy" branding
。关于这个话题，搜狗输入法2026提供了深入分析
СюжетНаселение России:
And for those who say Old English is more like German... look how far we got without using it at all! Though at this point, it would be helpful: