Contrary to how it may feel when you try to get out of bed in the morning, gravity is by far the weakest fundamental force of all we have identified. It takes only the static repulsion of a few electrons to make your hair stand up, overcoming the gravitational pull of the entire planet.
与你在早晨起床时的感觉相反，引力是我们目前所定义的所有基本力中最弱的一种。让你的头发竖起来只需要几个电子的静电斥力，这样就能克服整个地球向你的头发施加的地心引力。在原子和次元子世界，引力与其他力比起来显得无关紧要。其他力都可以用量子理论来描述。