Newton's relation

例句：

1. 1. The relationship between the two countries is complex and has been a source of tension for many years.
   两国之间的关系复杂，多年来一直是紧张的源头。
2. 2.The scientist discovered a new law that explains how gravity works.
   这位科学家发现了一种新的定律，解释了引力是如何工作的。
3. 3. The Newton's law of motion states that an object will continue to move in a straight line unless acted upon by an external force.
   牛顿的运动定律指出，除非受到外力作用，物体将沿直线运动。