Then they rolled down a pass, the chocolate-toned rocks forming a wall on both sides, from one of which fell a heavy jagged shade over half the roadway.

然后他们滚下一条通道，巧克力色的岩石在两侧形成一堵墙，从其中一堵墙中，一大片参差不齐的阴影覆盖了一半的道路。