Ergonomics experts have warned about laptop problems for years -- mostly in vain .
人体工学专家多年来一直在提醒笔记本电脑的问题，但是往往是徒劳无功。
For instance , even with a bluetooth keyboard , the ergonomics of using the ipad for writing just don 't work .
举例来说，就算有一个蓝牙的键盘，从人体工效学上来讲，用ipad来进行写作也是不大适当的。
Psychology is applied to individuals via mental health treatment , performance enhancement , self-help , ergonomics , and many other areas affecting health and daily life .
The app , which costs $ 49.99 , gives users full access to wolfram alpha 's capabilities and greatly improves on the speed and ergonomics of wolfram alpha 's mobile site .
