邮件标志必须有描述。请单击描述或在“标志”框中键入自己的文字。

The message flag must have a description. Please click a description or type your own text in the Flag box.

youdao

文字的诞生，是人类由蒙昧步入文明的标志。

The birth of written languages marks the dawn of human civilization.

youdao

文字是人类进入文明时代的标志。

The words are the important sign of Human civilization.

youdao

文字是人类进入文明时代的标志。

The words are the important sign of Human civilization.

youdao