There is a trapezoidal vegetable field with an upper base of 50 meters, a lower base of 80 meters, and a height of 70 meters. There is a rectangular pool in the middle of the field with a length of 18 meters and a width of 10 meters. What is the actual area of the vegetable field in square meters?
有一块梯形菜地，上底50米，下底80米，高70米，这块地中间有一个长18米，宽10米的长方形水池，这个菜地的实际种地面积是多少平方米．
<gadget id="calculator">50 + 80</gadget>
<output>130</output>

<gadget id="calculator">70 / 2</gadget>
<output>35</output>

<gadget id="calculator">130 * 35</gadget>
<output>4_550</output>

<gadget id="calculator">18 * 10</gadget>
<output>180</output>

<gadget id="calculator">4_550 - 180</gadget>
<output>4_370</output>

<result>4_370</result>