Blaming Diseases Staggering Disparity Million Historians Indigenous Population

意群训练： Increasingly ，historians are blaming diseases imported from the Old World for the staggering disparity between the indigenous population of America in 1492 — new estimates of which soar as high as 100 million ，or approximately one-sixth of the human race at that time —and the few million full-blooded Native Americans alive at the end of the nineteenth century .

标志： Increasingly, historians are blaming diseases (imported from the Old World) for the staggering disparity ［between the indigenous population of America in 1492—new estimates of which soar as high as 100 million, or approximately one-sixth of the human race at that time —and the few million full-blooded Native Americans (alive at the end of the nineteenth century)］.

译文： 越来越多地，历史学家们 正在 把 ［在 1492年美洲当地人口数量——最近对此数量的估计升至了一亿或当时人类数字的约六分之一 ——与 （19世纪幸存的）几百万纯血的印第安人之间数量的］巨大不同 归罪于 从欧洲传入的疾病。

解释： 这个句子中嵌套了两个固定搭配：一个是blame A for B，意思是把B归罪于A（注意不要看反）；另外一个是between...and...。本句难读的原因，是这两个固定搭配所连接的内容都太长，尤其是blaming diseases (imported from the Old World) for the staggering disparity ［between... and... ］中的“for”之后的内容还包括了between...and...这个固定搭配。between与and之间的插入语的长度触目惊心，使得句子的长度愈发臃肿，结构愈发模糊。