On a drawing with a scale of 8:1, the length of a precision part is measured to be 2mm. What is the actual length of this part?
在一张比例尺为8：1的图纸上，量得某精密零件的长为2毫米，这个零件的实际长是多少．
<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>