It takes 2 minutes to saw a piece of wood into 5 sections, how many minutes will it take to saw in total.
将一根木头锯成5段，每锯一次要2分钟，一共要锯多少分钟．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>