I walked to the window and pulled back the curtain, feeling the sudden breeze, the abrupt drop in temperature.

我走到窗前， 拉开窗帘，感受到突如其来的微风，突然降温。

This new development expanded  government spending as well, essentially dropping the curtain on the  worst economic disasters in American history.

这一新发展也扩大了政府支出，基本上揭开了美国历史上最严重的经济灾难的帷幕。