采用专用轨道和自动调节的双轮结构，推拉平稳轻快，无噪音。
It can be pushed and pulled smoothly without noise as it adopts special rail and automatic adjusting double-wheel structure.
采用专用轨道和自动调节的双轮结构，使之推拉平稳轻快，无噪音。
With the usage of special purpose tracts and automatically adjustable double-bank wheels, making the pushes and turns of the door are steady, fast and noiseless.
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