If the altitude of land A is -10 meters, and the altitude of land B is 6 meters, how much is the altitude of land B higher than land A?
A地的海拔高度是-10米，B地的海拔高度是6米，则B地比A地海拔高多少米．
<gadget id="calculator">6 - (-10)</gadget>
<output>16</output>

<result>16</result>