The children are no longer young.孩子们不再年青了。

No longer 表示“再也不”，用作状语，也可以写成not…any longer .例如：

He can do it no longer.

他再也干不成了。

I'll come here no longer.

我再也不来了。

I won't help you any longer.

我再也不会帮助你了。

★　They put small presents in each other's stockings.

They put small presents in each other's stockings.他们都在对方的袜子里放了小礼品。

Each other 表示“互相”，用于两人之间。例如：

We don't know each other.

我们互相都不认识。

We study each other and help each other.

我们互相学习互相帮助。

★　You are never too old to enjoy Christmas Day.

You are never too old to enjoy Christmas Day.你总不会因年纪大了而不喜欢圣诞节。

Too…to do…表示“太…以致不能做…”。例如：

He is too old to go to school.

他太老了，不能去学校了。

The box is too heavy for me to carry it.

箱子太大了，我搬不动。