Expanding element imports and package imports in place.

适时的展开元素和包的导入。

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Also, expanding a search result will show the references to the element.

同样，展开一个搜索结果将会显示对元素的引用。

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Based on the potential theory, an expanding contracting virtual boundary element method (ECVBEM) is presented to solve the vibration and sound radiation from a cavity with an arbitrary shape.

以位势理论为基础，提出了求解含任意形状空穴外场声辐射的伸缩虚拟边界元法。

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