What is the number made up of 7 thousands and 3 ones?
由7个千和3个一组成的数是多少．
<gadget id="calculator">7 * 1_000</gadget>
<output>7_000</output>

<gadget id="calculator">7_000 + 3</gadget>
<output>7_003</output>

<result>7_003</result>