他们设计的装置看起来像一个按比例放大的声学斗篷：一些环绕在被保护物体周围的同心圆。
Their proposed device would look like a scaled-up acoustic cloak: concentric circles of posts surrounding a hidden object.
割圆连比例曾是清代无穷级数研究中所用的主要方法，但对它的研究目前还不够充分。
Cyclotomic continued proportion was the principal method for studies on infinite series in the Qing Dynasty, which we still have to go into a step further.
割圆连比例不可能为清代级数论提供坚实的基础。
The cyclotomic continued proportion is impossible to furnish Qing-times series with a solid basis.
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