crests
The crest of a hill or a wave is the top of it.
A bird's crest is a group of upright feathers on the top of its head.
Both birds had a dark blue crest.
两只鸟都长着深蓝色的羽冠。
A crest is a design that is the symbol of a noble family, a town, or an organization.
On the wall is the family crest.
墙上是家族饰章。
on the crest of a wave
If you say that you are on the crest of a wave, you mean that you are feeling very happy and confident because things are going well for you.
The band is riding on the crest of a wave with the worldwide success of their number-one-selling single.
这个乐队目前正处于巅峰,他们的单曲全球销量第一。