zenith

复数：zeniths

n.the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected

1. The company reached its zenith in the early 2000s, when it was the market leader.
   这家公司在2000年代初达到了巅峰时期，当时它是市场的领导者。
2. At the zenith of her career, she was awarded the Nobel Prize for Literature.
   在她职业生涯的巅峰时刻，她获得了诺贝尔文学奖。