Water is composed of hydrogen and oxygen in a ratio of 1:8, of which, how much is hydrogen
水是由氢和氧按1：8的比例化合而成的，其中，氢占多少
<gadget id="calculator">8 / 1</gadget>
<output>8</output>

<gadget id="calculator">1 + 8</gadget>
<output>9</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>