他在大学的任期长达10年。

His ___tenure at the university lasted for 10 years.

她获得了终身教职后，终于可以安心做研究了。

After receiving ___tenure, she could finally focus on her research.

根据合同规定，他享有这块土地的20年使用权。

Under the contract, he has the ___tenure of this land for 20 years.