private secretary
noun [ C ] uk/ˌpraɪ.vət ˈsek.rə.tər.i/ us/ˌpraɪ.vət ˈsek.rə.ter.i/
私人秘书
a secretary who works for a business manager or official, dealing with their letters, filing, etc.
（部长的）私人助理
someone whose job is to help a government minister