翻译下面的话 不能机译 翻的好的 加分

About 7 million years ago, human began to appear on earth. During this long time of lives, they have not only created great history but also accumulated rich knowledge. All the brilliant civilizations can not be maintained until now without their languages, which make incredible contribution to the development of human civilization and society, as a tool of recording, conserving and distributing knowledge.

p.s. 为了通顺 语序稍有变化

About 700 million years ago, human beings appeared on Earth. In a long life, not only created a great human history, but also accumulated a wealth of cultural knowledge, a wide range of civilization depended on their text has been preserved. As a matter of record, preservation, dissemination of knowledge of the tools, the progress of human civilization, and promote social progress and played an important contribution.

这应该是比较标准的翻译了

About 700 million years ago, human beings appeared on earth. In their long life, people not only crea