The street plan of the city has evolved as a series of concentric rings.
该城市的

面图像一圈圈的同心圆环。
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This is a carefully coordinated event, where they had a very specific security construct built around it to ensure, even though they are in open air and in the public, all threads within all concentric rings are being mitigated.
这
一项精心协调的活动,他们在它周围建造了一个非常特殊的安全结构,以确保即使它们在露天和公共场所,所有同心圆内的所有线程都得到缓解。
By the time these Petri dishes reached a sufficient stage of growth, they began revealing some wonderful concentric growth patterns and irregular hues and textures which I came to regard as little works of art in their own respect.
当这些培养皿生长到足够阶段时,它们
始展现出一些美妙的同心生长图案, 以及不规则的色调和纹理, 我逐渐将它们视为各自独特的小型艺术品。