The trouble is that part of the recent acceleration is due to the usual rebound that occurs at this point in a business cycle, and so is not conclusive evidence of a revival in the underlying trend.
　　【结构分析】
　　本句是个主系表结构，主语是The trouble，is是系动词，表语是一个that引导的名词性从句，放在本句中就叫表语从句。
　　我们重点要搞清楚的就是这个表语从句。part of the recent acceleration is due to the usual rebound that occurs at this point in a business cycle是表语从句的第一部分，是个主系表结构，系动词是is；and后面is not conclusive，也是个系表结构，但是没有主语，据此我们可以判断and连接的是两个系表结构，主语是同一个acceleration。
　　表语从句的第一部分主干是acceleration is due to the rebound，due to...是形容词短语，介词to后的宾语the usual rebound后面又跟了一个that引导的定语从句（that occurs at this point in a business cycle）。
　　表语从句的第二部分由and so连接，和第一部分是并列加因果的关系。due to...意为"由…引起的"。如：The team’s success was largely due to her efforts.
　　【参考译文】
　　问题在于，近几年（出现）的生产力快速增长现象部分是由于商业周期到了这个时点通常会出现的反弹造成的，因而它不是经济复苏已经成了潜在趋势的确凿证据。