n.

1. 形成，構成，組成[U]
   the formation of one's character

   性格的形成

2. 構成物；形態，結構[C][U]
   Clouds are formations of condensed water vapor.

   雲是水汽凝聚而成。

3. 隊形；陣式[U][C]
   They marched in parade formation.

   他們以列隊的陣式行進。

n.

1. the action of forming or the process of being formed.
2. a thing that has been formed; a structure or arrangement.
   ▸a formal arrangement of aircraft in flight or troops.