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请分析一句英语until recently this system was very successful but re

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请分析一句英语
until recently this system was very successful but recently there have been problems.
上面这句中,until recently this system was very successful怎么翻译?是说之前都是successful的是吗?还是主要强调最近出现了问题?
请分析一句英语until recently this system was very successful but re
后半句是重复了,可以删除,这是个把状语提前的强调句型,until的意思“直到.为止”,注意是止了,句子的意思是“该系统一直运行情况良好直到最近才出了一些问题.” 可以把until recently 还原,就有了 This system was very successful until/till recently.
比较一些下面一句话的意思:
This system was not successful until recently.
该系统一运行情况糟糕直到最近才有所改善.
I couldn't fall asleep until 1‘clock last night.这句话的意思你也清楚了吧 就是问问题怎么不给分