I tried a 3 million sample size with this improvement. This took 12 seconds.
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，推荐阅读新收录的资料获取更多信息
Vegetarian diets and cancer risk: pooled analysis of 1.8 million women and men in nine prospective studies on three continents | British Journal of Cancer，详情可参考新收录的资料
runs until it reaches the requested index,，推荐阅读新收录的资料获取更多信息