zenith

正午时分，太阳位于天顶，光线直射下来。

At midday, the sun reaches its ___zenith, shining directly overhead.

这位歌手的职业生涯在2010年达到了巅峰，那时她赢得了所有主要音乐奖项。

The singer's career reached its ___zenith in 2010 when she won all the major music awards.

这家小型科技公司在产品登上某大杂志封面后达到了顶峰。

The small tech company reached its ___zenith after the product was featured on the cover of a major magazine.