yi2
nan2
za2
zheng4
  1. dubious or hard-to-treat cases (medicine)
  2. hard cases

Characters

  • 疑 (疑): (bound form) to doubt; to suspect
  • 难 (難): difficult (to...); problem; difficulty; difficult; not good
  • 杂 (襍): variant of 雜|杂[za2]
  • 症 (症): disease; illness

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