英语翻译在这段话中 it had been kept under wraps for 20,25 years如何理解,A

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英语翻译
在这段话中 it had been kept under wraps for 20,25 years如何理解,
As soon as it became clear in the American consciousness that Polk’s aim in the Mexican War was to gain Southwestern territory—California and what’s now the American Southwest—then the slavery question becomes very,very salient in a powerful way that it had been kept under wraps for 20,25 years

it指代the slavery question
奴隶制问题被隐藏了20,25年
原文这个数字是不是有问题,为什么是20/25年
以上翻译和分析是绝对没有问题的
再问： 20/25年是指这个问题被拖了20-25年，这个数字应该这样理解。
另外，前面的 in a powerful way 如何理解？
谢谢！
再答：强烈、显著、突出，就是从这个问题被隐藏了20-25年之久，可见奴隶制的问题是多么突出，还是强调becomes very very salient的

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