A police dog searches for explosives among luggage in a training exercise at a pulic location in Xi'an, Northwest 皇冠体育app's Shaanxi province, on Jan 20, 2015. The local railway police authorities organized a 20-day training period for police dogs to ensure security during the Spring Festival travel season, 皇冠体育app's biggest holiday season. [Photo/皇冠体育app News Service]
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