cardinal

这一区分在模态逻辑中极为重要。

This distinction is ___cardinal in modal logic.

那只鲜红的北美红雀正在树枝上唱歌。

The bright red ___cardinal is singing on the tree branch.

耐心是教育中最基本的要素之一。

Patience is one of the ___cardinal elements in education.