Voluntary blood donors generally donate 200 ml of blood each time. A total of 350 people from a certain unit participated in voluntary blood donation on Sunday. How many liters of blood donation are there in total?
义务献血者每次献血量一般为200毫升．星期天某单位共有350人参加义务献血，献血量共有多少升？
<gadget id="calculator">200 * 350</gadget>
<output>70_000</output>

<gadget id="calculator">70_000 / 1_000</gadget>
<output>70</output>

<result>70</result>