反衝力

backlash / recoil / reactive force

contrary / in reverse / inside out or upside down / to reverse / to return / to oppose / opposite / against / anti- / to rebel / to use analogy / instead / abbr. for 反切[fan3 qie4] phonetic system

recoil (of a gun) / to bounce back / backlash

thoroughfare / to go straight ahead / to rush / to clash

powerful / vigorous / pungent / towards / in view of

momentum (the force exhibited by a moving body) / (fig.) momentum (capacity for progressive development)

power / force / strength / ability / strenuously