The earth's surface area is 510 million square kilometers, of which the ocean area is 361 million square kilometers. How much more is the ocean area than the land area?
地球表面积是5.1亿平方千米，其中海洋面积3.61亿平方千米，海洋面积比陆地面积多多少亿平方千米？
<gadget id="calculator">5.1 - 3.61</gadget>
<output>1.49</output>

<gadget id="calculator">3.61 - 1.49</gadget>
<output>2.12</output>

<result>2.12</result>