This continuing research has followed 6, 000 people since 1956, testing them every seven years.
该研究自1956年起跟踪调查了6000名受试者，每隔七年对他们进行一次测试。
This continuing research has followed 6,000 people since 1956, testing them every seven years.
该研究自1956年起跟踪调查了6000名受试者，每隔七年对他们进行一次测试。
Continuing research, technical innovation, and adaptation of the programme strategy to local circumstances were critical factors in the success of the eradication effort.
持续研究、技术创新、适应当地情况的战略规划是根除努力取得成功的关键因素。
Continuing research, technical innovation, and adaptation of the programme strategy to local circumstances were critical factors in the success of the eradication effort.
持续研究、技术创新、适应当地情况的战略规划是根除努力取得成功的关键因素。
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