Experiments have already been done in this field, but only on a small scale.
该领域的实验已在进行，但是仅是小规模地进行。
Experiments are conducted at model and full scale and are often motivated by ongoing field work in developing countries.
实验以模型或全尺寸进行，实验的构想常常是由开发中国家正在施作的案例所激发出来的。
Study of water-demand regulations and water use efficiencies under condition of different irrigation systems of rice were carried out by serial field-scale experiments.
根据田间试验对宁夏引黄灌区水稻需水规律及节水灌溉条件下水稻田水分利用效率开展研究。
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