It is generally believed (=thought) that the chief reason for the increase in population in developed coutries is not so much the rise in birth rates as the decline in death rates as a result of the improvement in medical care.8. …causes (produces, brings about, leads to, results in …)
（因果关系）毫无疑问，需求的增长导致了价格的上涨。
There is no doubt that the increase in demand causes(results in/leads to) the rise in prices.
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