Gear box is made up of sliding table by the bed, skateboard, screw, gearbox, etc.
变速箱式滑台由床身，滑板，丝杠，变速箱等组成。
It has three elements, namely the sliding surface (with), smooth the bed, slippery body;
它有三个要素，即滑动面（带） 、滑床、滑体；
It has three elements, namely the sliding surface (with), smooth the bed, slippery body;
它有三个要素，即滑动面（带） 、滑床、滑体；
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