When the engineering team repaired the railway, the part that needed to be repaired (1/9) was repaired for the first time, and the part that needed to be repaired was repaired the second time (2/9). What percentage of the railway remained unrepaired?
工程队修铁路，第一次修了要修部分的(1/9)，第二次修了要修部分的(2/9)，还剩几分之几的铁路没有修？
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(1/9) + (2/9)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>