All the children must learn a foreign language.

所有的儿童必须学一门外语。

They were all babbling away in a foreign language.

他们都叽里咕噜地说着外语。

Video is a good medium for learning a foreign language.

录像是一种学习外语的好方法。

You can't expect to learn a foreign language in a few months.

不要指望在几个月内就能学会一门外语。

A good dictionary is indispensable for learning a foreign language.

一本好词典是学习外语必备的。