Concerning the keyword search in XML document, the meaningless query results are studied from two aspects: equivalence of content in element labels and similarity in element structure.

针对XML文档关键字搜索问题，从元素标签内容等价和元素结构相似性等价两个方面考虑无效的查询结果。

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Based on finite element analysis and the principle of mechanical equivalence, the supporting structures for the hydrogen and oxygen turbine pumps of a rocket engine were analyzed.

在对某火箭发动机氢、氧涡轮泵支撑结构进行有限元分析的同时，对该结构进行了力学理论探讨。

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