Used to indicate that among a group or range there are some examples; often appears as 'among them, there are/are also...' to point out exceptions or examples.
参加者の中には外国から来た人も多かった。
Among the participants, there were many people who came from abroad.
この中には高齢者に優先される席もある。
Among these, there are seats prioritized for the elderly.
中には賛成できない意見もあったが、全体としては賛成だった。
There were some opinions among them that I could not agree with, but overall it was agreed.