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英语翻译Although local fixed line calls were still the most popu

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英语翻译
Although local fixed line calls were still the most popular in 2002,the gap between the there categories had narrowed considerably over the second half of the period.这句话最后的over the second half of the period是什么意思
应该是 three 打错了
应当是在那个时期的后半段时间的意思.
再问: over 在这是什么意思 the second half 是后半段的意思么?
再答: OVER有覆盖一段时间段的含义,这里的意思是 那三种类型的差距在那个时间段的后半期,大幅度的缩小了。