The book was written by some college professor who's spent her entire professional life in an ivory tower.这本书是某位大学教授写的,她一生都在象牙塔中从事专业研究。The professor lived in an ivory tower.这个教授生活在象牙塔中。We hope that people here don't just live in an ivory tower.我们希望这里的人们并不只是活在象牙塔里。