Last year's precipitation was 839 millimeters, and this year's precipitation is expected to be 173 millimeters more than last year. How many millimeters of precipitation is expected this year?
去年的降水量为839毫米，预计今年的降水量比去年多173毫米．预计今年的降水量为多少毫米？
<gadget id="calculator">839 + 173</gadget>
<output>1_012</output>

<result>1_012</result>