[with obj.]place (something) on or above something else, especially so that they coincide 把…放在上面;叠加 [as adj. superposed]a border of superposed triangles. 几个重叠的三角形所形成的边界。
派生 superposition noun 语源
early 19th cent.: from French superposer, from super- 'above' + poser 'to place'