This is a graph that shows the degree to which voting in Congress falls strictly along the left-right axis, so that if you know how liberal or conservative someone is, you know exactly how they voted on all the major issues.
这幅曲线图显示出国会里的 投票在很大的程度上完全的沿着左和右两个轴， 也就是说，如果你事先知道一个人是自由派还是保守派的话， 你就可以准确的预测出这个人在很多重大问题上是怎样投票的。