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An investigation into the incident is under way.
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（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。
Thought to be made from a cattle femur, this decorated Anglo-Saxon spindle whorl, used to provide weight while spinning yarn, was unearthed from farmland near Bishopstone, Buckinghamshire.