迄今为止最好的证据是叶酸，即维生素B的一种。
The best evidence to date concerns folate, one of the B vitamins.
众所周知，诸如水果、蔬菜类的健康食物含有促进身体健康的营养物质——即人体必需的抗氧化物、维生素和矿物质。
It is common knowledge that healthy foods such as fruits and vegetables contain certain nutrients that promote good health — namely antioxidants, vitamins and minerals that are essential to the body.
其大部分的收入来自直销市场（即垃圾邮件）以及诸如红酒、维生素片和书籍等五花八门的商品销售。
Most of its money comes from direct marketing (that is, junk mail) and sales of things as varied as wine, vitamins and books.
但知道现在这种说法在人类中才有据可查，即研究人员观察了人们消耗的维生素多少，然后算出了肿瘤的总数。
But until now the human evidence has been mostly observational, meaning researchers looked at how much of the vitamin people consumed and then counted up the cancers.
但知道现在这种说法在人类中才有据可查，即研究人员观察了人们消耗的维生素多少，然后算出了肿瘤的总数。
But until now the human evidence has been mostly observational, meaning researchers looked at how much of the vitamin people consumed and then counted up the cancers.
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