The researchers also note the recession hit some years before we see the beginning of the well-being drop, and before the steepest well-being decline, which occurred in 2013.
2019年12月六级真题（第一套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
ADJ-GRADED
陡的;陡峭的;陡直的
A steep slope rises at a very sharp angle and is difficult to go up.