弦力,应力,张力,场力, volatility, 保守力:对椭圆形(场)的破坏与恢复
when loose, 弦 is nothing, little matter; when tied up to two points, 场forms, when disturbed, 场力 functions, like atoms, neuclear power, relativity theory
when loose, 弦 is nothing, little matter; when tied up to two points, 场forms, when disturbed, 场力 functions, like atoms, neuclear power, relativity theory