Greater demands were being placed on the police by growing violence and left- and right-wing extremism.暴力事件以及左右翼极端主义日益猖獗，这对警察提出了更高的要求。A traffic island at the junction separates left- and right-turning vehicles.交叉路口的交通安全岛将左转车辆和右转车辆隔离开来。The nation as a whole was thoroughly polarized into left- and right-wing groups.整个国家分化成了完全对立的左翼和右翼两大派。