But undeniably, there would simply be no progress without radicals.

但不可否认的是，没有激进分子就不会有进步。

They abandoned the traditional, head-in-the-sand mentality of denial and exploited the opportunities presented by their often larger, but undeniably obsolete, brethren.

他们放弃了传统的、“将脑袋埋入沙子里的”否定思维，并且利用的经常是那些较大、却无法否认是过时了的“老大哥”提供的机会。