adj.同一中心的，同轴的
adv.同一中心地，同轴地
On a blackboard, he drew five concentric circles.
他在黑板上画了5个同心圆。
The street plan of the city has evolved as a series of concentric rings.
该城市的街道平面图像一圈圈的同心圆环.
Concentric spheres are parallel.
同心球面是平行的.
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