extending the issue of the two-parent versus one-parent family is, "To what extent are these notions validated " cross-culturally?"
将双亲和单亲家庭的问题扩展了一下，“这些概念究竟在多大程度上,会因跨文化差异而有所变化
2
The children must cross the road only with a teacher or parent.
孩子们必须和老师或父〔母〕亲一起过马路。
3
The effect of selection was closely related with parent characteristics. The effect of different selection methods to select protein content varied with cross types.