It looks like a bimodal distribution of some kind.

它看起来像是某种双峰分布。

So it's possible you actually have a bimodal distribution.

所以有可能你实际上有一个双峰分布。

Myasthenia gravis preferentially affects young women in their 20s and 30s and older men in their 60s and 70s, but the cause of this odd " bimodal" distribution of age-of-onset isn't quite clear.

重症肌无力易影响二三十岁的年轻女性和六七十岁的老年男性，但这种奇怪的“双峰”发病年龄分布的原因尚不清楚。