The inner parts of something are the parts contained or enclosed inside the other parts, closest to the centre.
双语例句
例: She got up and went into an inner office.
她起身走进里间办公室。
例: inhabitants of the inner city.
城市中心的定居者。
例: Wade stepped inside and closed the inner door behind him.
魏德走了进去,随手带上了里面的门。