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On a blackboard, he drew five concentric circles.

他在黑板上画出五个同心圆。

《柯林斯英汉双解大词典》

Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree.

爬行动物的骨骼生长在本质上是周期性的，在骨头上产生一系列的同心圆，就像树木的年轮一样。

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In contrast, starlings apparently enjoy an influential equality in which any one of them can start a concentric cascade in a new direction.

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Think of a concentric muscle movement as lifting a heavy object overhead.

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"That's a very sensible step at the moment, " said Roderick Jones, a vice president of Concentric Solutions and a former special branch officer.

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