求翻译：在全面搜集了国内外挖掘机液压系统相关资料的基础上，了解了挖掘机液压系统的发展历史，并对挖掘机液压系统的技术发展动态进行了分析总结。是什么意思？

Comprehensive collection of excavator hydraulic system at home and abroad on the basis of relevant information, learn the history of hydraulic system in excavator, and were made to the technical development of excavator hydraulic system analysis and summary.