Surprisingly, that's a subcategory of the solution.
令人惊讶的是，这是解决方案的一个子类。
奇思妙想物语
The smallest subcategory in any domain is what we would call a first principle.
任何领域中最小的子范畴就是我们所说的第一原理。
雅思口语备考指南
Now these are... these are kind of a subcategory of used clothes.
这些是......这些是旧衣的一个子类。
《金融时报》 Podcast
Yeah, that is a special subcategory of gorpcore that exists, as far as I can tell, only to infuriate me.
是的，据我所知，这是 gorpcore 的一个特殊子类别，只是为了激怒我。
华尔街日报
The really cool thing about how NFTs have really exploded is that it's given sort of all kinds of art a chance to shake out and find its own subcategory, right?
In mathematics, a subcategory of a category C is a category S whose objects are objects in C and whose morphisms are morphisms in C with the same identities and composition of morphisms. Intuitively, a subcategory of C is a category obtained from C by "removing" some of its objects and arrows.