It's a present for one of my children.

　　這是送給我的一個孩子的禮物。

　　The children are at different stages of development.

　　這些孩子處于不同的成長階段。

　　It's only human to want the best for your children.

　　為自己的孩子謀求最好的條件是人之常情。

　　Mark has two children to support from his first marriage.

　　馬克得扶養他第一次婚姻生的兩個孩子。

　　Many children can't function effectively in large classes.

　　許多孩子在大班上課時學習效果不好。