“使先具有”较为贴切的英文表达可以是 “enable to possess beforehand” ，不过这种表述在英语中不算特别常见自然，更常见会根据具体语境灵活处理。以下为你提供不同语境下可能更合适的表达示例：
“equip with in advance”
例句：The training program is designed to equip trainees with the necessary skills in advance. （这个培训项目旨在使受训者先具有必要的技能。）
“provide ... with a foundation in advance”
例句：The basic courses provide students with a solid theoretical foundation in advance for their future studies. （基础课程使学生先具有坚实的理论基础，以供他们日后的学习。）
“allow to have beforehand”
例句：The policy allows eligible families to have access to affordable housing beforehand. （这项政策使符合条件的家庭能够先具有获得经济适用房的机会 。 ）
“enable to acquire beforehand”
例句：The financial aid enables students from poor families to acquire learning materials beforehand. （这笔经济援助使学生来自贫困家庭的学生能够先具有学习资料 。 ）