问题如下：
The shape of the yield curve is frequently cited as a predictor of economic growth. Which of the following statements is wrong?
选项：
A. The curve tends to be steep at the bottom,
B. The curve tends to be flatten in expansion until it is very flat or even inverted at the peak
C. The curve tends to be inverted in subsequent contraction.
解释：
C is correct
曲线在底部趋于陡峭，在扩张时趋于平缓，直至在峰值时非常平缓甚至反转，然后在随后的收缩中再次变陡（而非反转）。在收缩阶段，短期利率会下降，债券收益率也会下降。收益率曲线大幅变陡。
因此A,B选项说法均正确，只有C选项的说法错误，入选。
请问答案中说的在随后的收缩阶段种变陡峭而非invert是什么意思？ 强化课程中老师讲在下行期invert 没有说在peak时invert。。
