Stick-slip flow is a jerky movement of compacted grains with velocity of particles at the walls slightly lower than in the rod like core.
粘附滑移流动是一种密集颗粒的急跳式的运动，在壁面处，颗粒的速度稍低于呈杆状的中心的速度。
Snow falls as hexagonal crystals, but once on the ground, snow is soon transformed into a compacted mass of smaller, rounded grains.
雪以六角形晶体的形式落下，但一旦落到地面，雪很快就会变成一团更小、更圆的颗粒。
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