swimming pool is 80 meters long. Xiao Ming swam 2 round trips. How many meters did he swim in total?
一个游泳池长80米，小明游了2个来回，一共游了多少米？
<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">80 * 4</gadget>
<output>320</output>

<result>320</result>