The eldest son is being groomed to take over when his father dies.

长子正在接受培养，以在父亲过世后接手父业。

《牛津词典》

John will come into a fortune when his father dies.

约翰在父亲死后可以继承一笔遗产。

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John will come into a fortune when his father dies.

约翰在父亲死后可以继承一笔遗产。

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