Based on the theory of elastodynamics, the interaction of elastic surface acoustic waves with surface-breaking defect is studied numerically by using the finite element method.

基于弹性动力学理论，采用有限元方法数值模拟了声表面波沿金属表面传播及其与表面缺陷相互作用的过程。

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Detection of surface-breaking cracks has been realized by signal processing method using the reference signal from a surface without flaws. The principle and experimental results are given.

本文以无缺陷时的表面回波为参考信号，用信号处理方法，识别表面缺陷回波，从而实现对表面缺陷的检测。文中给出了该方法的原理及实验结果。

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Drilling technology has improved, allowing tunnels to be dug without breaking the surface.

在钻孔技术发达的今天，打通地下隧道已经不会伤及地表了。

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Sporting a brushed stainless steel surface, and with a record-breaking slim profile of only 8.9mm thickness, the HE720 demonstrates once again the company's consistently strong ability to combine top performance with style.

ENGADGET: ADATA's got an 8.9mm thick portable USB 3.0 drive, limbos under the competition by .1 of a millimeter

Though that also makes it more flexible (and makes the ability to grind and polish the glass to create a light-capturing parabolic surface without actually breaking the thing all the more impressive), this flexibility can be exploited to keep the reflective surface in shape.

ECONOMIST: Japan��s new telescope

Puffs of dust were evidence of the ball breaking the surface of the pitch as it landed - and batting last should be awkward.

BBC: Jonathan Agnew column