All theories originate from practice and in turn serve practice.

所有的理论都来源于实践，并反过来为实践服务。

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All theories originate from practice and in turn serve practice.

任何理论都来源于实践，反过来为实践服务。

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All research results serve the productive practice directly, and provide the important technique theories for the construction and building of the hydropower station.

研究结果直接服务于生产实践，为该水电站的施工和建设提供重要的技术理论支持。

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