cardinal

这一区分在模态逻辑中极为重要。

This distinction is ___cardinal in modal logic.

这位红衣主教在梵蒂冈主持了重要的宗教仪式。

The ___cardinal presided over an important religious ceremony at the Vatican.

育儿的基本原则是身教而非言教。

The ___cardinal principle of parenting is to lead by example rather than by lecture.