详细解释:n. 装紧, 压紧
【医】 嵌入, 嵌塞, 阻生(牙)
英语解释：
名词 impaction:
the condition of being pressed closely together and firmly fixeda disorder in which feces are impacted in the lower colona disorder in which a tooth is so crowded in its socket that it cannot erupt normally同义词：impacted tooth