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 .

心理学以它特有的形式影响并服务于人类的生活，比如：精神健康医疗，能力提升，自助，人体工学及其它相关领域。

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 .

该软件售价$49.99，具有网站版产品的所有功能，并且在速度和人体工学方面较手机版网站有大幅改进。