是复数,例如:
1. The children came in two by two.孩子们一对一对地走了进来。
2.I can't imagine life without the children now.我现在无法设想没有了孩子们的生活。
3.The children are at different stages of development.这些孩子处于不同的成长阶段。
4.The children are completely out of control since their father left.这些孩子自他们的父亲离开后就无法无天了。