To build a road, the full length (2/6) was built on the first day, and the full length (2/6) was built on the second day. What fraction of the total length was built in two days? How much is left unrepaired?
修一条路，第一天修了全长的(2/6)，第二天修了全长的(2/6)，两天一共修了全长的几分之几？还剩下几分之几没有修？
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<result>1/3 = around 0.333333</result>