What I mean is there are some special marks in the two copies of coupon and so we may know which AD has a better effect!
我的意思是我们在这两份优惠券上设有的特别的数字记号，这样就能看出哪份广告反响更强。
What I mean is there are some special marks in the two copies of coupon and so we may know which AD has a better effect!
我的意思是我们在这两份优惠券上设有的特别的数字记号，这样就能看出哪份广告反响更强。
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