Her elder sister Princess Beatrice, 20, also loves touring and spends just as much as her.

她20岁的姐姐比阿特丽斯公主也同样热爱旅行，和她花一样多的钱。

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Although, as Earl Spencer proved at his sister Princess Diana's funeral, it is possible both to prepare every word and to act naturally.

尽管如此，正如厄尔·斯宾塞在他妹妹戴安娜王妃的葬礼上所证明的那样，准备好每句话并表现得自然是可能的。

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Her first Tube journey was in May 1939 as a 13-year-old princess, accompanied by her sister Princess Margaret and governess, Marion Crawford.

BBC: Queen and Catherine visit Baker Street Tube station

And this week, the secretary of Princess Cristina and her sister, Princess Elena, was named as a suspect in the same case.

CNN: STORY HIGHLIGHTS

In one, Kate is captured wearing a bikini and strolling on a beach with her husband on Mustique, a favourite destination of the Queen's late sister, Princess Margaret.

BBC: The Duchess of Cambridge