permanent secretary
noun [ C ] uk/ˌpɜː.mə.nənt ˈsek.rə.tər.i/ us/ˌpɝː.mə.nənt ˈsek.rə.ter.i/
（政府行政部门的）常务秘书
(in the ) a government official who belongs to the Civil Service (= the official departments responsible for putting government plans into action) rather than an elected government