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.
唐还说，骆家辉还试图用优惠券来购买咖啡，但是营业员拒绝了。
Locke tried to use a coupon or voucher for the coffee, but the barista rejected it, Tang said.
有些教会正把电影票与星巴克咖啡优惠券一起到处派发，用以鼓励人们开展观后讨论。
Some churches are giving away tickets along with Starbucks vouchers to encourage post-film discussion.
应用推荐