滚筒直径可根据用户需要定做。
The roller's diameter can made according to customers'requirement.
同一种滚筒直径又有几种不同的轴径和中心跨距供设计者选用。
One drum diameter has varied diameters of shaft and central spans so that the designers may have choice.
这是原文，直译的话，应该是“传动滚筒直径在一定程度上根据皮带跑偏特性来定义。
The necessary pulley diameter is defined at a certain radius by the deflection properties of the belt.
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