1. Methods:To analyse 52 samples of food impaction retrospectively. 方法：分析52例食物嵌塞患者的临床资料。
2. Basic concepts of Multimedia Home Platform, MHP are introduced and the value and impaction of MHP to the digital TV and interactive TV broadcasting are discussed. 介绍了多媒体家庭平台（MHP）的基本概念，讨论了MHP对于数字电视和交互电视行业的意义和响。
3. The sandwich material is pore-closed foamed aluminum with high porosity, which can effectively absorb the impaction energy and bear the deformation due to high-speed impaction. 所述的夹芯材料为高孔隙率的闭孔泡沫铝，可以有效吸收冲击产生的能量，承受高速撞击带来的变形。
英英解释
n.
1. the condition of being pressed closely together and firmly fixed
2. a disorder in which feces are impacted in the lower colon
3. a disorder in which a tooth is so crowded in its socket that it cannot erupt normally
4. a sharp collision produced by striking or dashing against something
