那是一个反复试验的过程。
“这是个需要不断摸索，反复试验的过程”考夫曼博士说，“谷物和几乎所有的蔬菜都是很好的食品。”
"This is a trial-and-error process," Dr. Koufman said. "Grains are good, and almost all the vegetables."
这很可能也是一个迭代过程，同样应该使用反复试验的方法。
It will likely be an iterative process as well, using the trial and error approach again.
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