必要条件 bì yào tiáo jiàn

DEFINITIONS

  1. requirement
  2. necessary condition (math)

CHARACTERS

必 bì
HSK 3
surely, most certainly; must
要 yào
HSK 2
necessary, essential; necessity
条 tiáo
HSK 2
clause, condition; string, stripe
件 jiàn
HSK 2
numerary adjunct for article; matter