英语语法分析

Could it be the prevalence of tea in their culture?

是因为茶在他们的文化中流行而造成的吗？

The prevalence of black and Asian faces among those targeted has caused especial resentment.

黑人和亚洲人的面孔在那些目标人群中普遍存在，这引起了特别的不满。

Epidemiological studies have found that children with PDD have no higher prevalence of gastrointestinal tract than normal children.

流行病学研究发现，广泛性发育障碍（Pervasive Developmental Disorder）孩子和正常孩子相比较并没有更高的胃肠道患病率。