In other words, if we measured speed as a function of distance -- this is the only time I'm going to show a graph, OK -- we would expect that it goes down as the distance increases from the center of the galaxy.
换言之，如果我们测量速度作为距离的函数--- 这是我唯一一次展示图表，好吗？ 我们会期待它会减小 随着距离星系中央的路程增加。