With special raw material (raw rubber bearing) and small friction coefficient; electricity -saving.
含特殊原料原橡胶轴承，摩擦系数小，更省电。
The material of metal friction often is much bigger than the molten plastic.
这些物质对金属材质的磨擦力往往比熔融塑料的大得多。
The material of metal friction often is much bigger than the molten plastic.
这些物质对金属材质的磨擦力往往比熔融塑料的大得多。
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