短语讲解：

1. Later, touch is important when we are young children learning about the world.

learn about 获得，学得; 得知有关…的消息
例句：Childrenseem to learn about computers by osmosis.
儿童似乎不知不觉地就了解了计算机。

2. Many of them have been out of touch with each other.

each other 互相，彼此
例句：Both girls write to each other regularly now.
两个姑娘现在定期互相通信。

3. Now, let us listen as two friends talk about the party they are about to attend.

talk about 讨论，谈论
例句：He went on to talk about his accident.
他接着谈到了他的意外事故。