广义的剪纸就是用剪刻工具在薄质材料上的镂空造型；

In board sense, Paper cutting is a sculpture by using the carved tools to sculpt the thin material;

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本文研究理想流体中薄质球壳受激振动辐射声波的非线性传播。

This paper deals with the non-linear propagation of sound waves radiated by a thin spherical shell vibrating in ideal fluid.

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所以真珠质的厚度就像脸上化妆品，不久就会磨薄了。

As a resul t, nacre thickness is sometimes just a cosmetic layer t hat can wear thin over time.

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