1. By a cunning trick he became heir of the rich widow.
    他策划了一个狡猾的计谋, 成了这有钱寡妇的继承人。

2. He is heir to the crown.
    他是王位继承人。

3. He is the legitimate heir to the property.
    他是这宗财产的合法继承人。

4. He moved back to Hiroshima at 40; it was expected of him as the sole male heir to their name.
    40岁时他又把家搬回了广岛。他作为这个姓氏的惟一男性继承人，家人都盼望他这样做。

5. A family name becomes defunct when the only heir dies without any son.
    当唯一的继承人死去了之后没儿子，那这个姓就要绝迹了。