这个缺陷已存在一段时间了，但直到最近才被非法利用，尤其是黑色星期五前这段时间。
The flaw has existed for a while but has only recently been exploited, particularly in the run up to Black Friday.
黑色经济，非法经营：国家经济中相当数量被隐藏的部分，以未被告发的私人现金交易而进行。
A sizable hidden segment of a country's economy that operates on numerous unreported private cash transactions.
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