gravitationn.[物]引力；吸引作用；下沉gravitational lens引力透镜gravitational wave重力波gravitational slip重力滑坡gravitation theory引力理论gravitational type重力式gravitational high重力高gravitation filter重力式滤器,过滤澄清器,重力滤器gravitational tide引力潮gravitational fieldn.[物]引力场；重力场gravitation settler重力沉降槽

1. Who discovered the Law of Gravitation?
   谁发现了引力定律？
2. We have to submit to law of gravity.
   我们必须服从引力定律。