persistent; persevering;persist in one’s purpose; unremitting ? 這一偉大理想，要經(jīng)過許多代人～地努力奮斗才能最終實現(xiàn)。This great ideal can be finally realized only through persevering hard struggle over many generations.
堅持不渝jiān chí bù yú
渝：改變、變動。堅持到底，決不改變。persistent, persevering, hang on, be firm and unchanging