1. They will hardly know which facts to select from the great mass of evidence that steadily accumulates.
    对于逐渐积累起来的庞大材料，他们几乎不知道选取哪些好，

2. "Select breads and cereals with the words 'iron-added' on the label," writes sports diet expert Nancy Clark.
    "选择那些标有'加铁'字样的面包和麦片，" 运动营养专家南希·克拉克写道，