对许多冒险者来说，攀登珠穆朗玛峰是终极的挑战。

For many adventurers, climbing Mount Everest is the ___ultimate challenge.

这趟游轮提供极致的奢华体验。

This cruise offers the ___ultimate luxury experience.

对我来说，遇到蛇是最大的恐惧。

For me, encountering a snake is the ___ultimate horror.