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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Two sorts of echoes caused by the reradiation of elastic surface wave have been observed in experimentation: the radial surface backscattering wave and the longitudinal surface backscattering wave.

实验观测到两类由弹性表面波的再辐射产生的回波：径向表面反向散射波和纵向表面反向散射波。

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Imagine an elastic band stretched over the surface of an apple. The band can slowly shrink, moving as though it is slipping from the surface, until it becomes just a dot on the apple's skin.

试想一下，有一个橡皮圈箍在苹果的表面上，然后这个橡皮圈慢慢的收缩，就像从苹果表面上滑落一般的收缩，直到它变成了一个点。

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"The new material is a liquid-infused elastic porous surface, which is what allows for the fine control over so many adaptive responses above and beyond its ability to repel a wide range of substances, " Prof Aizenberg explained.

BBC: New material can halt runny liquids on demand

Imagine an elastic band stretched over the surface of an apple.

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If making the sponge by hand, knead it on a lightly floured surface for 8 to 10 minutes, until elastic and no longer sticky.

NPR: Two Centuries of 'Baking in America'