The radius of the large circle is 3 cm and the radius of the small circle is 2 cm. The big circle does not move, and the small circle rolls along the circumference of the big circle. When the small circle returns to the original point, how many times does the small circle go?
大圆半径是3cm，小圆半径是2cm．大圆不动，小圆沿大圆的圆周滚动，当小圆回到原点，小圆转了多少圈？
<gadget id="calculator">2 * 3.14 * 3</gadget>
<output>18.84</output>

<gadget id="calculator">2 * 3.14 * 2</gadget>
<output>12.56</output>

<gadget id="calculator">18.84 / 12.56</gadget>
<output>1.5</output>

<result>1.5</result>