自经济衰退以来，参与食品救济券计划的人数直线飙升（见图表）。
Participation has soared since the recession began (see chart).
下一节解释您现在作为用户能看懂的食品券参与率显示图背后的实现。
The next section documents the implementation behind the food stamp participation display you now understand as a user.
近4000用户参与了试验，并目睹了自己用回收垃圾的三分之一多换取抵用券，可用以得到免费咖啡或者在当地商店中打折。
A trial of almost 4,000 households saw them put out a third more recycled waste in exchange for vouchers to get free cups of coffee and discounts in local shops.
由于Threshold字段中的值是动态变化的，所以州或属国的颜色会根据这个州的食品券参与率而改变。
As the value in the Threshold field changes in the animation, the color of a state or territory changes based on the food stamp participation rate of that state.
研究团队为了加以佐证而进行了第二个试验，试验有两类人参与，分别给予一类人酒吧的抵用券，另外一类人书店的抵用券。
The team backed this up with a second experiment that involved giving people one of two vouchers: either to spend at a bar, or to spend at a bookshop.
研究团队为了加以佐证而进行了第二个试验，试验有两类人参与，分别给予一类人酒吧的抵用券，另外一类人书店的抵用券。
The team backed this up with a second experiment that involved giving people one of two vouchers: either to spend at a bar, or to spend at a bookshop.
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