The two groups of children have quite different characteristics.
这两组儿童具有截然不同的特点。
Children usually transfer to secondary school at 11 or 12.
儿童通常在11或12岁时升读中学。
It's a present for one of my children.
这是送给我的.一个孩子的礼物。
The children are at different stages of development.
这些孩子处于不同的成长阶段。
It's only human to want the best for your children.
为自己的孩子谋求最好的条件是人之常情。