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联合国国际麻醉品管制局委员、中国药物依赖性研究所所长郑继旺认为,中国的毒品问题不容乐观:旧毒未除,新毒又来
Zheng Ji-wang, member of the United Nations International Narcotics Control Board and director of the China Institute of Drug Dependence, believes that the drug problem in China is not optimistic: old drugs have not been eradicated yet new drugs have come