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.
撕下这张优待券，用它再买一瓶咖啡可省25便士。
Tear off this coupon and use it to get 25p off your next jar of coffee.
撕下这张优待券，用它再买一瓶咖啡可省25便士。
Tear off this coupon and use it to get 25p off your next jar of coffee.
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