大倒退

例句：

1. 1. The company's sales have seen a significant drop in the past quarter.
   公司过去季度的销售额出现了显著下降。
2. 2.The economy is experiencing a substantial slowdown.
   经济正在经历一个实质性的放缓。
3. 3. The stock price has taken a sharp dive since the announcement.
   自宣布以来，股价已经急剧下跌。