攀登珠穆朗玛峰被视为登山者的终极挑战。

Climbing Mount Everest is considered the ___ultimate challenge for mountaineers.

这家酒店提供极致的奢华体验，是度假的终极选择。

This hotel offers the ___ultimate in luxury and is the perfect choice for a vacation.

工会向管理层提交了他们的最后通牒。

The union presented their ___ultimatum to the management.