请纠正下方一段描述的语法错误，使其更通顺准确。
Currently in use writing system among, Chinese is oldest. In China, people from different regions possibly not understand each other's dialects, but because Chinese characters have unified writing form, they communicate with each other almost no difficulty. Chinese language history has played important role in unite Chinese nation.
Currently, the Chinese writing system is the oldest among all the languages. In China, people from different regions may not understand each other's dialects, but because the characters have a unified form, they can communicate with each other almost without any difficulty. Furthermore, the history of the Chinese language has played an important role in uniting the Chinese nation.
请纠正下方一段描述的语法错误，使其更通顺准确。
Currently in use writing system among, Chinese is oldest. In China, people from different regions possibly not understand each other's dialects, but because Chinese characters have unified writing form, they communicate with each other almost no difficulty. Chinese language history has played important role in unite Chinese nation.

Corrected: Currently, among the writing systems in use, Chinese is the oldest. In China, people from different regions may not understand each other's dialects, but because Chinese characters have a unified writing form, they can communicate with each other with almost no difficulty. The history of the Chinese language has played an important role in unifying the Chinese nation.