The company commander took 10 soldiers across the river, but 6 soldiers had already passed, and there were still a few standing guards who hadn't crossed the river.
连长带着10名战士过河，已经过了6名战士，还有几名站士没过河．
<gadget id="calculator">1 - 6</gadget>
<output>-5</output>

<gadget id="calculator">10 + (-5)</gadget>
<output>5</output>

<result>5</result>