But because some people do not plan their pregnancies, several countries require that the grains used to make bread, breakfast cereals and suchlike be fortified with folic acid.
不过，由于有些人生孩子之前没有计划，个别国家规定：凡是谷物，不论用于制作面包、早餐麦片或其他食物，都要添加叶酸。
On average, Yang's team found that the women consumed 128 mcg of folic acid from fortified foods each day.
杨氏领导的团队发现女性每日平均从强化谷物摄取128毫克的叶酸。
Folic acid is found in many fortified cereals. It can also be obtained from totally natural sources including green, leafy vegetables, beans and nuts.
在很多的谷类产品，包括绿色叶类蔬菜、豆类和坚果中也天然存在叶酸。
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