The altitude of A is -150 meters, and the altitude of B is 135 meters. How many meters is the difference between A and B?
甲地海拔高度是-150米，乙地海拔高度是135米，甲、乙两地地势相差多少米．
<gadget id="calculator">135 - (-150)</gadget>
<output>285</output>

<result>285</result>