Social scientists have found that children growing up in single-parent families are disadvantaged in some ways when compared to those from two-biological-parent families.
社会学家发现，和在双亲家庭成长起来的孩子相比，单亲家庭长大的孩子在某些方面稍显劣势。
2
Certainly, the biological link between parent and child is fundamental.
当然了，父母和孩子之间的生理联系是基本的。
3
Today's families may include both the biological mother and father or a single parent or guardian, grandparents or other extended family, same-gender parents, or foster parents.