a system that uses coordinates to establish position
双语例句
Or your reference frame is at rest in an aircraft that accelerates rapidly on takeoff. 另外，你的参照系静止在一架起飞之后迅速加速的飞机上。
Additional insight is gained by examining the elastic collision of equally massive particles in the center-of-mass frame of reference. 对质量相等的两质点的弹性碰撞更彻底的理解，可通过质心参照系而获得。
The diffusion of a particle or molecule with respect to a stationary frame of reference was discussed in the preceding chapter. 一个粒子或者分子相对于稳定参考系统的扩散已在前一章中作过讨论。
