zhǔn​wěn​xuán​wō​jié​gòu

quasi-stationary spiral structure

  1. quasi-
    (bound form) quasi-; para-; semi-
  2. wěn adjective
    steady
    firm and stable; not shaking or moving
  3. whirlpool
    whirlpool; vortex; eddy; volution; also refers to a turbulent and difficult situation; now commonly written as 漩涡 xuán​wō
  4. structure
    structure; composition; makeup; architecture; the way various parts are arranged to form a whole