altissimo

adj.very high

1. The saxophonist demonstrated exceptional control in the altissimo register.
   这位萨克斯手在极高音区展现了非凡的控制力。
2. Singers need advanced training to safely reach altissimo notes without straining their voices.
   歌手需要高级训练才能在不伤嗓子的情况下达到极高音。