The need to communicate is a key characteristic of human society. 需要交流是人类社会最重要的一个特征。Scientists conti

相关介绍

The need to communicate is a key characteristic of human society.

需要交流是人类社会最重要的一个特征。

Scientists continue to push back the boundaries of human knowledge.

科学家不断扩大人类知识的范围。

The cost in terms of human life was high.

付出了很大的生命代价。