1·A fortunate encounter brought the two friends together after a long separation.
两位老朋友长期分离这次才有幸相遇。
—— 《新英汉大辞典》
2·Obviously, there's not much sense of stereo-channel separation unless you have a very skinny head.
很明显，除非你有一个非常瘦的脑袋，否则没有多少立体通道分离的感觉。
3·The separation of positively and negatively charged particles takes place during the development of the storm cloud.
在暴风云的形成过程中，带正电荷的粒子与带负电荷的粒子相互分离。
4·When that separation lasts for a period of time, the two populations are able to evolve along different trajectories.
当这种分离持续一段时间后，这两个种群能够沿着不同的轨迹进化。
5·We reasoned that these two eventually reach some kind of an equilibrium separation, which we are using lowercase r to represent.
我们推导这两个最终能达到某种平衡分离，我们用小写的 r 来表示。