尊重语义就可以了……

Although the singular “they” seems uniquely modern, it is not. Single individuals could be “they” in relative clauses. The OED offers this miniature history: “With an antecedent referring to an individual generically or indefinitely (e.g. someone, a person, the student), used esp. so as to make a general reference to such an individual without specifying gender.” The OED’s first example is from 1450. Here is a good example from the writings of Lord Chesterfield from 1759: “If a person is born of a … gloomy temper … they cannot help it.” The magazine The Listener, a model of mid-twentieth-century British prose, offers this example from 1968: “When somebody becomes prime minister they’re immediately put on a pedestal.”