必需

bìxū
  1. to need
  2. to require
  3. essential
  4. indispensable

CEDICT

Entry Composition

1 必 bì
  1. certainly
  2. must
  3. will
  4. necessarily
2 需 xū
  1. to require
  2. to need
  3. to want
  4. necessity
  5. need