进行了研究，利用非线性二择一不动点定理建立了问题正解的一个存在性原则。

By using nonlinear alternative fixed_point theorem, a existence principle of positive solutions to this problem are established.

youdao

他们也提议对于确保数百万中产阶层不交纳二择一最低税进行调整，后者原先设计用于仅仅对最富裕的美国民众进行征税。

They also propose paying for a fix to keep millions of middle class taxpayers from paying the AMT, a tax that originally was meant for only the wealthiest Americans.

youdao

这是一个二择其一的问题。

This is a binary decision.

youdao