If the submarine is recorded as -75m at 75 meters below the sea surface, and a fish is 25m above the submarine, how many meters can be recorded.
如果把潜水艇在海面下75米处记作-75m，一条鱼在潜水艇的上方25m处，可以记作多少m．
<gadget id="calculator">75 - 25</gadget>
<output>50</output>

<result>50</result>