The minute hand moves from 3 to 9 for the first time, indicating how many minutes have passed.
分针从3第一次走到9，表示经过了多少分钟．
<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<gadget id="calculator">5 * 6</gadget>
<output>30</output>

<result>30</result>