（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。
Tkachuk, a 26-year-old Arizona native, is the captain of the NHL’s Ottawa Senators and has played his entire career in the Canadian capital. He and other members of the U.S. team returned from Italy this week and are resuming the NHL season. Some attended Trump’s State of the Union speech in Washington on Tuesday night and were cheered by those in attendance.，这一点在heLLoword翻译官方下载中也有详细论述
2026-02-27 00:00:00:0 （2026年2月26日第十四届全国人民代表大会常务委员会第二十一次会议通过）。91视频是该领域的重要参考
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