To better achieve this purpose, we divide the implementing process into three stages: preliminary stage, mid stage and later stage, each with different orientations.
为了更好地在高校开展研究性学习，我们可将其实施分为三个阶段：初期阶段、中期阶段、后期阶段。在不同的阶段有不同的目标定位。
A field experiment was conducted to study the nutrient balance and economic benefit on winter-wheat and rice system with mid-stage effluent of ammonium sulfite method irrigation.
通过田间实验，研究亚铵法制浆中段水经土地处理的同时作为灌溉用水的农田养分平衡状况及经济效益。
A field experiment was conducted to study the nutrient balance and economic benefit on winter-wheat and rice system with mid-stage effluent of ammonium sulfite method irrigation.
通过田间实验，研究亚铵法制浆中段水经土地处理的同时作为灌溉用水的农田养分平衡状况及经济效益。
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