“环形的”的英语？

山为环形的破火山口洼地环抱着.The mountain is encircled by the doughnut - shaped depression of the caldera.如果轴是倾伏的, 就会产生环形的或锯齿状的山脊与山谷.If the axis plunges, loop - shaped or zigzag patterns of ridges and valleys result.该设备的目的就是为了判定径向和环形的...