1.（尤指问题或困难）永恒的，持续的，亘古不变的 You use perennial to describe situations or states that keep occurring or which seem to exist all the time; used especially to describe problems or difficulties.
perennially Both services are perennially short of staff. 两个机构一直都是人手不够。
英英释义
1.(botany) a plant lasting for three seasons or more
