precategory

例句：

1. 1.The precategory of the problem is its complexity.
   问题的前类别是它的复杂性。
2. 2. The precategory of a noun is its gender and number.
   名词的前类别是它的性别和数。
3. 3.In mathematics, the precategory of a function is its domain.
   在数学中，函数的前类别是它的域。