疏於防範 shū yú fáng fàn

DEFINITIONS

  1. to neglect to take precautions
  2. relaxed vigilance

CHARACTERS

疏 shū
HSK 6
neglect; careless, lax
於 yú in, at, on; interjection alas!
防 fáng
HSK 5
defend; prevent; embankment
範 fàn pattern, model, rule, law