yī dàn
HSK 2.0 等级 5 HSK 3.0 等级 5

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释义

  1. 1. in case (sth happens)
  2. 2. if
  3. 3. once (sth happens, then...)
  4. 4. when
  5. 5. in a short time
  6. 6. in one day