the figure for the US dipped to only 4%for much of this period

问题描述:

the figure for the US dipped to only 4%for much of this period
for much of this period中的for much 什么成分和用法

介词短语作状语,原因状语.这句话怎么翻译这一时期的大部分时间,美国的数据下降只有4%