On a map with a scale of 1:10000, the length of 2 cm represents the actual distance in kilometers.
比例尺是1：10000的地图上，2厘米的长度表示实际距离多少千米．
<gadget id="calculator">1 / 10_000</gadget>
<output>1/10_000 = around 0.0001</output>

<gadget id="calculator">2 / (1/10_000) / 100_000</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>