马铃薯：马铃薯是美式菜单中的主食，因为根据研究表明，马铃薯几乎占蔬菜类食品消费量的30%。
Potatoes: Potatoes are a staple of the American diet - one survey found they account for 30 percent of our overall vegetable consumption.
目的观察人群日摄氟量降低和主食结构变化，对尿氟的不同影响。
Objective Finding the different effects on urine fluoride by decreasing fluoride daily intake of human beings an changing the staple food structure.
调查还发现白领中有39%主食摄入量不足；仅有22%常吃粗粮；77%不了解平衡膳食营养知识。
The study also found that 39% have not enough staple food and only 22% often eat coarse grains. 77% have no understanding of what constitutes a balanced diet.
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