The two inner items are 3 and 0.8 respectively, and the two outer items are how many and 1.2.
两个内项分别是3和0.8，两个外项分别是多少和1.2．
<gadget id="calculator">0.8 / 1.2</gadget>
<output>0.666667</output>

<gadget id="calculator">3 * 0.666667</gadget>
<output>2.000001</output>

<result>2.000001</result>