Recently, Steve Cummer, Associate Professor of Electrical and Computer Engineering at Duke University announced that it is theoretically possible to create such a sound shield.

近日，杜克大学电子信息工程学院副教授Steve Cummer声称，从理论上这种声音屏障是可造的。

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But the poor geological adaptability, construction may face some problem, this paper discussed with an engineering example of shield method in urban subway construction strategies of the special area.

但其地质适应性太差，施工时会面临一些难题，本文结合工程实例探讨了盾构法在城市地铁特殊地段的施工对策。

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Shield tunnelling through a mix ground has been always one of hard points annoying much the underground engineering community.

复合地层的盾构施工一直是困扰地下工程的难题之一。

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Several models have been put forward as to how such a feat of "geo-engineering" might actually be achieved, most involving the positioning of a reflective shield of some sort out in space.

CNN: The shield of Ra: Could solar reflection save the planet?