1. The mountain reached its peak at sunrise.（山峰在日出时达到了顶峰。）

2. She is at the peak of her career right now.（她现在正处于职业生涯的顶峰。）

3. The company's revenue has been on a peak in the past two years.（公司过去两年的收入一直处于顶峰。）

4. The weather here has been at its peak for the summer.（这里的夏天天气一直很好。）

5. They are experiencing peak demand for their product.（他们正在经历产品需求的顶峰。）

希望这些句子对你有所帮助!