劍橋詞典used in writing instead of "she or he" to refer to a person whose sex is not known （在書麪語中代替 she or he，表示某人性別未知）他或她 If any employee needs to take time off, s/he should contact the Personnel Department. 任何雇員需要休假，應(yīng)與人事部聯(lián)系。 也見they 返回 s/he