impaction

压缩；松散物质的堆积。

A compression; the packing together of loose matter.

紧密堆积之物；密集物质的团块。

Something packed together tightly; a mass of densely-packed matter.

坚硬的、不能移动的粪便块。

A solid, immobile bulk of stool.

牙齿因邻牙、骨质覆盖过密、软组织过多等因素而无法萌出至牙弓。

The failure of a tooth to erupt into the dental arch, because of adjacent teeth, dense overlying bone, excessive soft tissue, or other factor.

院校(通常是学院或大学)收到的合格申请人数超过可用名额,导致满足最低入学要求也不保证被录取的情况。

The situation where an institute, usually a college or university, receives more applications from qualified applicants than the number of spaces available, meaning that meeting the minimum admission requirements does not guarantee acceptance.