concentric ring

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.

Accordingly, a whole series of concentric bright and dark rings will surround the central spot.

因此, 环绕着中央点将会有整整一系列同心亮环和暗环.

Acoustic scattering from submerged double infinite concentric cylindrical shell insonified by incident plane wave is studied.

研究水下双层无限长圆柱壳体的声散射.

Concentric nothingnesses swaddle my heart, a bell that never rings.

一层层同心的虚无是我心的襁褓, 裹着一口永不敲响的钟.

The result of this experiment indicates two conclusions, one of which is that concentric annuluses appearing in PHB spherocrystal in orthogonal polarized light are as a result of difference in height of 200nm~ 500nm between growth steps by reason of step-like or auger-type growing of PHB spherocrystal.

结果发现：实验用的PHB球晶是台阶式生长或螺旋式生长，其生长台阶高度差在200nm~500nm之间；