题目

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

提问时间：2021-03-31

答案