Just like the grammar point の中（なか）で～が一番（いちばん）～, this grammar point may be used when marking one thing from within a group, and then further describing it. The only difference is that の中（なか）で by itself simply marks something as being ‘among (A)’, or ‘within (A)’, rather than being the ‘most (A)’.

• ラーメンの中（なか）では味噌（みそ）ラーメンが好（す）き。
  Among ramen, I like the miso type.
• このバンドの中（なか）では誰（だれ）が好（す）き？
  Who do you like in this band?

の中（なか）で is also frequently used to describe things that are happening within a place, and will translate simply as ‘in (A)’, in these cases.

• 車（くるま）の中（なか）で夕食（ゆうしょく）を食（た）べました。
  I ate dinner in my car.