Dad wants to saw a piece of wood into 3 sections, and it takes 2 minutes to saw one section, how many minutes will it take to finish sawing the piece of wood.
爸爸想把一根木头锯成3段，锯开一处需要2分钟，锯完这根木头需要多少分钟．
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<result>4</result>