A piece of round steel is (3/4) meters long, and (1/3) is used to make 4 parts. How many parts are there left to make?
一段圆钢长(3/4)米，做4个零件用去了(1/3)，剩下的还够做几个这样的零件？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

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

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<result>8</result>