The 10 members of the school dance team line up to perform aerobics. The distance between two adjacent people is 2 meters. How long is the team?
学校舞蹈队10名队员排成一队表演健身操，每相邻两人间隔2米，这支队伍长多少米？
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">2 * 9</gadget>
<output>18</output>

<result>18</result>