The things that something is composed of are its parts or members. The separate things that compose something are the parts or members that form it. 组成
When someone composes a piece of music or composes, they write music. 创作 (乐曲); 作曲 • Vivaldi composed a large number of very fine concertos. 维瓦尔蒂创作了大量非常优美的协奏曲。
-pos- Pos, posit=put, 表示“放”"compose v. 组成;作曲;使镇定(com 一起+pose→放到一起 →组成)