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This is a impaction of life and art .

这是一次艺术与生活的碰撞。

Problems of energy of tamping impaction .

强夯冲击作用的能量问题。

Impaction is one of the important models in nonsmooth dynamical systems .

碰撞是非光滑动力系统中一个重要的模型。

Unusual cause of colonic obstruction : gallstone impaction requiring mechanical lithotripsy .

结肠梗阻的罕见病因：需行机械碎石术的胆石嵌塞。

Result : complications included chronic gingivitis , acute pulpitis , masticatory pain , food impaction , tooth mobility , ceramic fracture , gingival discoloration , and esthetic unsatisfactory appearance .

结果：修复后出现的问题包括慢性牙龈炎、急性牙髓炎、咬合痛、食物嵌塞、牙松动、瓷崩、牙龈变色和美观效果差。