interoffice       
adjective [ before noun ] (also inter-office) uk/ˌɪn.tərˈɒf.ɪs/ us/ˌɪn.t̬ɚˈɑː.fɪs/
 (公司)部门间的
between or involving the different parts of a company
  She discovered the papers in her interoffice mail. 她在部门间的邮件中发现了这些文章。 
 Our interoffice communication is fast and accurate. 我们部门间的沟通很迅速精确。 
 - More examples
 - These changes will allow us to operate effectively across inter-office and organizational boundaries.
 - Fake invoices are an old trick designed to capitalize on poor interoffice communication.
 - They wrote an inter-office memo to their boss.
 - Senior managers travel frequently, but they also hold plenty of interoffice discussions using the internet.