The track matching the pulley is crucial for the use of sliding door. Generally, there are two types of sliding tracks: one is made of cold-rolled steel; the other one is aluminum alloy.

与滑轮相配套的轨道对于滑动门的使用也是至关重要的，滑动门常用的轨道一般有冷轧钢轨道和铝合金轨道两种。

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I also used Scale falloff in the Area section, to make a sliding transition toward the tracks.

我在区域的部分还用了缩放衰减工具使得滑条能过渡到痕迹。

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The possible tracks of a particle BXm_(2), sliding down along a free movable concave surface with the mass m_(1) are analyzed.

运用质心运动定理，分析了质点在可自由移动的凹曲面上滑下时，质点对惯性系的运动轨迹方程。

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Five years ago, he installed tracks on the ceiling and rollers to build a sliding wall system to transform the open-plan studio apartment into many different rooms.

BBC: Hong Kong copes with tight living spaces