vertical flow短语¹⁴⁴⁹⁷²⁺² 基本例句 竖直怜 The hydraulic characteristics of vertical flow constructed wetlands was investigated, and the influence of these characteristics on wastewater purifying efficiency was studied as an emphasis. 通过在污水中加入示踪剂，研究了人工湿地的水力学特点及其对污水净化效果的影响规律。 dictall