favourable condition短语¹⁴⁴⁹⁷²⁺² 基本例句 法优惠条件; 有利条件 Summing up all different techniques on removing iron in groundwater in China, we focus on discussing the method on removing iron, basic principle, favourable condition and economic benefit, etc. 综合国内目前各种地下水除铁技术，着重对各除铁系统的方法、基本原理和适用条件以及经济效益等进行了论述。 cnki