China has a vast land and a large population. Even though the Chinese language is spoken all over the country, people in different areas speak it in different ways, which are called dialects. Generally called local languages, dialects are branches of the Chinese language in different regions, and are only used in certain areas. Dialects of the Chinese language are very complicated. They differ from each other in three aspects: pronunciation ,vocabulary and grammar. And the difference in pronunciation is the most outstanding. Over2,000 years ago, Chinese people realized that a common language should be used in social activities. Compared with dialects，mandarin can be understood by all people. It is beneficial to information transmission and cultural exchange between ethnic groups and people indifferent places..

1.土地广阔：可转译为名词短语avastland。vast是指“幅员辽阔的”，这里不能用wide。但是表示物体的宽度时可以用wide,比如：Theriveris100mwide.(这条河宽100米。)

2.人口众多：即“很多的人口”，可转译为名词短语alargepopulation。

3.与...不同：可译为differfrom或bedifferentfrom。

4.发音的区别最为显著：可译为Thedifferenceinpronunciationisthemostoutstanding。

5.有利于：可译为bebeneficialto。

6.信息传递和文化交流：可译为informationtransmissionandculturalexcha