adj.空着的,未被占用的;空缺的;茫然的,若有所失的;
例句:
Vacant positions can be made known through the medium of the press.
职位空缺可假托报纸公布于众.
to stare vacantly
茫然看着
He went over and sat down in a vacant chair next to Christine.
他走了过去,在克莉斯廷旁边的一把空椅子上坐了下来.