epoch-making
adj (fml or joc 文或謔) important and remarkable enough to change the course of history and begin a new epoch 開新紀元的; 劃時代的
the epoch-making discovery of America 發現美洲的劃時代的創舉
I told him his idea was not exactly epoch-making. 我告訴他說他的思想算不上是劃時代的.