你可以从汽水瓶上收集点数，然后去兑换打折优惠券。
You can collect points from the soda bottles and use them to get discount coupons.
有些提供徽章(在某人完成规定任务，比如在10个场所签到时将授予虚拟奖章)，有些甚至提供打折优惠券或免费项目。
Some offer badges (virtual MEDALS awarded when someone completes a set task, such as checking in to 10 venues); some even hand out coupons for discounted or free items.
使用优惠券能省钱是一种荒谬的说法，经常是你所买的打折的商品是你想要的，而非必须的。
It's that "use your coupons" myth in another form. What really happens is that the items you buy on sale are items you want, not need.
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