The runway is 120 meters long and 80 meters wide. After running 2 laps, how many meters are left is 1000 meters.
跑道长120米，宽80米，跑了2圈后，还差多少米是1000米．
<gadget id="calculator">120 + 80</gadget>
<output>200</output>

<gadget id="calculator">200 * 2 * 2</gadget>
<output>800</output>

<gadget id="calculator">1_000 - 800</gadget>
<output>200</output>

<result>200</result>