人体工学设计当长时间阅读，人们自然转移阵地频繁。

Ergonomic Design When reading for long periods of time, people naturally shift positions often.

youdao

人体工学设计当长时间阅读，人们自然转移阵地频繁。

Ergonomic Design When reading for long periods of time, people naturally shift positions often.

youdao