One book, I read (4/9), but I haven’t read the rest ((())/(())) of this book.
一本书，看了(4/9)，还剩下这本书的((())/(()))没有看．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>