heir at law
 法定繼承人


 Heir n.
 1. One who inherits, or is entitled to succeed to the possession of, any property after the death of its owner; one on whom the law bestows the title or property of another at the death of the latter.
    I am my father's heir and only son.   --Shak.
 2. One who receives any endowment from an ancestor or relation; as, the heir of one's reputation or virtues.
    And I his heir in misery alone.   --Pope.
 Heir apparent. Law. See under Apparent.
 Heir at law, one who, after his ancector's death, has a right to inherit all his intestate estate. --Wharton (Law Dict.).
 Heir presumptive, one who, if the ancestor should die immediately, would be his heir, but whose right to the inheritance may be defeated by the birth of a nearer relative, or by some other contingency.