Deficiency is the most frequently encountered vitamin deficiency in the U.S., but vegetarian women consume more folic acid on average than meat-eaters.

缺乏叶酸是美国最常见的维生素缺乏症，但食素的妇女比食肉的平均叶酸食用量要多。

Delamination is one of the most frequently encountered types in structures of composite laminates.

脱层是复合材料层板结构中主要的缺陷形式之一。