A shot put weighs 4 kg, a table tennis ball weighs 4 grams, how much is a table tennis ball lighter than a shot put in grams?
一个铅球重4千克，一个乒乓球重4克，一个乒乓球比一个铅球轻多少克．
<gadget id="calculator">4 * 1_000</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 - 4</gadget>
<output>3_996</output>

<result>3_996</result>