A vacancy is a job or position which has not been filled.
例句
They had a short-term vacancy for a person on the foreign desk...他们在国际新闻组有一个短期的空缺职位。Most vacancies are at senior level, requiring appropriate qualifications.大多数空缺属于高层职位，要求具备相应的资历。
N-COUNT
（旅馆里待租的）空房
If there are vacancies at a building such as a hotel, some of the rooms are available to rent.
例句
This year hotels that usually are jammed had vacancies all summer.今年,那些通常爆满的旅店整个夏天都有空客房。