The results of this paper are of practical significance to grain structural integrity analysis and computation of solid rocket engines.

该文的结果对固体火箭发动机装药结构完整性分析计算有重要的实用价值。

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In this paper, the design principle, structure features and the accuracy analysis method of a test system with accuracy of 0.5% for solid rocket engines are introduced.

本文论述了固体火箭发动机0.5%高精度测试系统的设计原则、结构特点和精度分析方法。

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However, from what I gather, "hybrid" rocket engines use both solid and liquid or gas propellants.

然而我的理解是，“混合动力”火箭引擎同时使用固体燃料和液态或气态推进剂。

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