问：这次研究的一个关键是由印度总登记官建立的样本登记制度。
Q: One of the keys to this tobacco study was the sample registration system established by the Registrar-General of India.
问：这次研究的一个关键是由印度总登记官建立的样本登记制度。
Q: One of the keys to this tobacco study was the sample registration system established by the Registrar-General of India.
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