Scientists have discovered that the number of petals, sepals, and fruits of plants are very consistent with a peculiar sequence: 1, 1, 2, 3, 5, 8, 13, 21, 34... Please observe this sequence carefully, its What should be the 10th number?
科学家发现：植物的花瓣、萼片、果实的数目等特征都非常吻合于一个奇特的数列：1、1、2、3、5、8、13、21、34…请你仔细观察此数列，它的第10个数应该是多少．
<gadget id="calculator">21 + 34</gadget>
<output>55</output>

<result>55</result>