必要

bìyào
  1. necessary
  2. essential
  3. indispensable
  4. required

CEDICT

Entry Composition

1 必 bì
  1. certainly
  2. must
  3. will
  4. necessarily
2 要 yào
  1. to want; to need; to ask for
  2. will; shall; about to
  3. need to; should
  4. if (same as 要是 yàoshi)
  5. (bound form) important