point of originpɔintɔvˈɔridʒin短语⁴¹²⁹⁰ 基本例句 起始点 Nonpoint pollution simulation models are parts of a category of“ loading Models” which represent the inputs and movements of materials from the point of origin to watercourses. 在城市径流非点源污染研究中,选择或建立一个实际可行的负荷模型很重要。 cnki