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问题: 请问如何理解这句话

The main reason for the population growth isn't so much a rise in birth rates as a fall in death rates as a result of improvements in medical care.帮忙一下,感激不尽

解答:

本句中词组not so much...as是理解句子的关键,表示程度,在句子中做状语,用以对比a rise in birth rates和a fall in death rates谁更是人口增长的主要原因,本词组决定了后者受到肯定.
句意:人口增长的主要原因是医疗保健的进步导致的死亡率下降,而不是由于出生率的上升.