主力

zhǔlì
  1. main force
  2. main strength of an army

CEDICT

Entry Composition

1 主 zhǔ
  1. owner
  2. master
  3. host
  4. individual or party concerned
  5. God
  6. Lord
  7. main
  8. to indicate or signify
  9. trump card (in card games)
2 力 lì
  1. power
  2. force
  3. strength
  4. ability
  5. strenuously