可实现双轨、三轨推拉功能，开启空间大，给人良好的视野空间。
Double rails and tree rails can apply to and large space can be realized after opening, providing a good vision.
介绍钢铝复合导电轨在三轨系统中的作用、工作原理、结构和常用材料。
The role, working principle, structure and commonly used material of steel aluminum composite conductor rail in the three-rail system are introduced.
研究人员汇集了2005，2007以及2009三年共149个属于初级、常任轨（ tenure-track，通常在聘用为教授时约定了5年左右的评估期，期满评估合格便转为终身教职的聘用形式——译者注）聘用形式的样本。
The researchers compiled a sample of 149 entry-level, tenure-track hires made during 2005, 2007 and 2009.
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