adj.
共中心的, 集中的

[ adj ]
having a common center
<adj.all>
concentric rings

Concentric \Con*cen"tric\, Concentrical \Con*cen"tric*al\, a.
[F. concentrique. See {Concenter}.]
Having a common center, as circles of different size, one
within another.

Concentric circles upon the surface of the water. --Sir
I. Newton.

Concentrical rings like those of an onion. --Arbuthnot.