求翻译：随着经济全球化的发展，跨国公司技术溢出效应对中国经济的影响也越来越大。本文通过阐述外国直接投资对我国技术溢出效应途径，及理论和实证分析技术溢出效应在我国不明显的原因，提出了我国强化跨国公司技术溢出效应的对策。同时，外国直接投资来源国差异性也日益成为影响外国直接投资技术溢出效应的重要因素。在此背景下,本文对FDI 来源国进行了5 组划分,同时基于全国总体,东部、西部、中部三个区域和中国南北方地区,分别研究了该因素差异性对我国技术溢出效应的影响并得出了相关结论。是什么意思？

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