The method in this paper, which can be used to calculate the interior sound field of arbitrary-shaped closed thin shell (equal or unequal thickness), suits a large scope.

本文所提出的这一方法适用面广，可以求出任意形状封闭薄壳(等厚度或不等厚度)的内部声场。

youdao

One spouse could be given special powers, such as a power to withdraw a fixed amount of trust property each year or a power to appoint trust property (in equal or unequal shares) among your descendants.

FORBES: Spousal Lifetime Access Trusts--Use Your Gift Tax Exemption Without Giving It All Away