concentric cylinder

例句：

1. 1. Theplanets are arranged in a concentric circle around the sun.
   行星围绕太阳排列成一个同心圆。
2. 2. The cylinder is concentric with the sphere.
   这个圆柱与球体是同心的。
3. 3. The concentric rings of the moon are visible from space.
   从太空可以看到月球的同心环。