During the competition, Liu Xiang has to cross 10 hurdles, and the distance between the two hurdles is about 9 meters. Please calculate how many meters there are from the first hurdle to the last hurdle.
比赛时，刘翔要跨10个栏，两栏间距离约为9米，请你算出从第一栏架到最后一个栏架约有多少米．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>