It's the steepest part of this trendline.

这是这条趋势线上最陡峭的部分。

1995 Um, that's not how you draw a trendline through

什麽时候开始的？

On the cbo's trendline the federal debt would roughly double to nearly 250% of gdp by mid-century.

根据 CBO 的趋势线，到本世纪中叶，联邦债务将大致翻一番，达到 GDP 的近 250%。