例句：
This research has done much to advance our understanding of language learning.
这项研究大大提高了我们对语言学习的认识。
Video is a good medium for learning a foreign language.
录像是一种学习外语的好方法。
All the children must learn a foreign language.
所有的`儿童必须学一门外语。
It takes a long time to learn to speak a language well.
学会说好一种语言需要花很长的时间。
The fashion at the time was for teaching mainly the written language.
那时教学时兴的主要是书面语。
A good dictionary is indispensable for learning a foreign language.
一本好词典是学习外语必备的。