I have already explained that through repetition a dog begins to look at a marker as a secondaryreward.
我已经解释过，经过重复，狗儿开始把标记当作次要的奖励。
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The 3rd "Chinese Bridge" Chinese Proficiency Competition for Foreign Secondary School Students and reward ceremony were closed in the Great Hall of the People of Chongqing on the evening of Oct. 28.