In an experimental field, (3/7) is planted with cucumbers, and the rest is planted with vegetables. What fraction of the field is occupied by green vegetables?
一块试验田，(3/7)种了黄瓜，剩下的种青菜，青菜地占了这块地的几分之几？
<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<result>4/7 = around 0.571429</result>