（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。
A post-mortem examination on 6 August gave the preliminary cause of death as multiple injuries.
。夫子是该领域的重要参考
电视一换新，高清线材的需求被带飞了，因为电视连机顶盒、显示器连电脑、投影连主机，几乎都绕不开它。
The budget supermarket will pay its store assistants £13.50 per hour from April — just a month after an increase is due to take effect in March.