Despite the complexity of the financial state of real world, a two-class problem has usually been considered to tackle this classification task.

尽管现实中企业的财务状况复杂多样，人们往往将财务预测当作两分类问题来解决。

youdao

Romney's core problem is this: He heads a party that must win two-thirds of the white working-class vote in presidential elections to compensate for its weakness in almost every demographic category.

CNN: Mitt Romney's painfully bad week