The capacity of a bottle of fresh milk is 250ml, the teacher bought 4 bottles, how many liters are there in total?
一瓶鲜奶的容量是250毫升，老师买了4瓶，共有多少升．
<gadget id="calculator">250 * 4</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 1_000</gadget>
<output>1</output>

<result>1</result>