A wire is 508 meters long, 361 meters were used for the first time, and 129 meters were used for the second time, how many meters is the wire now shorter than before?
一根铁丝长508米，第一次用去了361米，第二次用去了129米，现在铁丝比原来短了多少米．
<gadget id="calculator">361 + 129</gadget>
<output>490</output>

<result>490</result>