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Charles was three when his mother became Queen as her eldest son, heir to the throne.
现任女王伊拉莎白二世继承王位时, 查尔斯年仅三岁,当时身为长子的他便成了王位继承人.
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In the UK, it is customary for the next heir to the throne to be regent.
在英国, 通常由下一位王位继承人摄政.
《简明英汉词典》
4、
It's only the second time a potential heir to the throne has married a commoner.
一位可能的王位继承人与平民缔结婚约，这种事还只是第二次。
《柯林斯高阶英汉双解学习词典》
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