This project is very interesting due to its composition of removable parts connected to a toother wheel-worm screw mechanism that allows the raising and lowering of a stairway.
英
美
释义
这个计划是非常有趣的.;它的可移动的零件的构成;被连接到可以上升和降低楼梯的齿轮子螺丝机制。
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