documents, papers

accumulation

to pile up

the above / the top (position or direction) / the surface of / superior in skill, age, level, etc.

in addition; furthermore / on top of (which)

a desk; a piece of furniture for a writer or reader / (mass media, newspapers) a subeditor; a copy editor

upper, over

the start / a high place; the top / one with higher rank

the first volume in a two- or three-volume set

【Conjunction】after; on the basis of; upon