There is one famous poem in Tang poetry, which reads: "I left home when a mere young man, and returned in old age. My native accents (remain) unchanged, but my ear - lock had grown thin". This poem (apparent) shows language is not only a tool for communication, but also the indicator of people's cultural identity. In a linguistic(语言学的)sense, dialect refers to the variety of a specific language ( cause) by different geographical, social and cultural contexts.
Owing the vast areas and large population of China, diverse dialects can (find) in this great land, such as the Wu dialect in Shanghai, Hakka and Cantonese. However, it cannot be denied that since the popularization of Putonghua in China, the importance of dialects is lowering among Chinese people. To make matters (bad), some dialects have even disappeared due to the adoption of Putonghua is required in public places like schools and companies. (consider) the cultural significance of dialects, nowadays both Chinese (official) and common people are paying careful attention to preservation of dialects because it's the treasure of Chinese culture and art.
