疾病使人口减少了。
情报提供人士告诉我们，通过这些联合的计划，实现使人口减少50%的计划。
Our source tells us that the planned population reduction through these combined means is 50%.
在19世纪，奴隶贩子使人口锐减，到1877年，奴隶人口减少到111人。
In the nineteenth century slave traders decimated the population, which shrivelled to 111 people by 1877.
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