这一困难是根本性的，不易解决。

The difficulty is ___radical, not easily solved.

政府提出了彻底改革教育体系的激进方案。

The government proposed a ___radical plan to completely reform the education system.

这位候选人提出了彻底改变教育体系的激进方案。

The candidate proposed a ___radical plan to completely reform the education system.

这道数学题需要简化根号表达式。

This math problem requires simplifying the ___radical expression.