a successful marriage of quantum theory and gravity is the last major hurdle in demonstrating that the basic four forces of nature gravity electromagnetism and weak and strong forces that operate at the subatomic level are manifestations of a single force that dominated the universe in the first few fractions of a second after the big bang with dark energy nature is giving us a hint of how it does quantum gravity riess says

量子理论和引力的成功结合是证明自然界基本的四种力——引力、电磁力以及在亚原子水平上起作用的弱力和强力——是一种单一力的表现，这种力在大爆炸后的最初几秒内统治着宇宙，而暗能量——的最后一个主要障碍

以上为机器翻译结果，长、整句建议使用 人工翻译 。