Dark energy is a mysterious repulsive force that opposes gravity, causing the universe to expand. 暗能量是一种神秘的与万有引力相反的排斥力,它使宇宙膨胀。
The hypothetical electron smeart must exert a net attractive Hellmann-Feynman force to counterbalance the internuclear repulsion. 假设的电子弥散必须提供净赫尔曼吸引力以抵消核间排斥力。