al·cove
noun/ˈælkəʊv/
/ˈælkəʊv/
- an area in a room that is formed by part of a wall being built further back than the rest of the wall
壁凹，凹室，壁龛（房内墙壁凹进空间） - The bookcase fits neatly into the alcove.
书架正好放得进壁凹。
Word Originlate 16th cent.: from French alcôve, from Spanish alcoba, from Arabic al-qubba ‘the vault’. - The bookcase fits neatly into the alcove.