突破: 1.(打开缺口) break through; make a breakthrough 短语和例子突破一点 make a breakthrough at some single point; 癌症研究上的一项重大突破 an important breakthrough in cancer; 突破敌人的防线 break through the enemy's defences
难以: difficult to 短语和例子难以比拟 hardly match; hardly equal; 难以否认 undeniable; irrefutable; 难以估计 be difficult to estimate; inestimable; 难以相处 be hard to get along with; 难以相信 incredible; 难以想象 unimagina