内耳对听力和保持平衡都很重要。

The ___inner ear is not only important for hearing but also for maintaining balance.

这栋大楼的内部电梯仅供员工使用。

The ___inner elevators in this building are for staff use only.

她的日记记录了她内心深处的情感。

Her diary reveals her ___inner feelings.

这本书揭示了公司内部的运作机制。

This book reveals the ___inner mechanisms of the company.