radical

n. 激进份子,原子团,激进派
a. 急进的,根本的,激进的,基本的,彻底的

The talks are aimed at radical reductions in the level of weapons.

那些会谈都以大幅度裁减军备为目标。

They called for a radical reform of our tax system.

他们要求对税收制度进行根本改革。