To build a road of 5 kilometers, how many kilometers are left after repairing 2000 meters?
修一条5千米的公路，修了2000米后，还剩下多少千米．
<gadget id="calculator">2_000 / 1_000</gadget>
<output>2</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<result>3</result>