tenure
n. （土地的）居住权，保有权；（尤指大学教师的）终身职位，长期聘用；（尤指重要政治职务的）任期，任职
v. 授予……终身职位（尤指教师、讲师职位）
例句
It's still extremely difficult to get tenure.
要取得终身职位仍然极其困难。
《牛津词典》
I know they will continue to provide valuable guidance as I begin my tenure as an international civil servant.
我知道，当我开始国际公务员的任期时，他们将继续提供宝贵的指导。
There can be no question that throughout Delmont's tenure the average paycheck in this city has been getting steadily bigger.
毫无疑问，在德尔蒙特任职期间，这座城市的平均收入一直在稳步增长。
