How handful of! however how they creep / As a result of my fingers towards the deep, / Even though I weep—though I weep! / O God! can I not grasp / Them by using a tighter clasp?知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。How to generate that the object sliding down along the regional axis