drop a clanger

例句：

1. 1. The raindrops fell on the windowpane.
   雨滴落在窗玻璃上。
2. 2. Theprice of oil dropped by5% last week.
   上周油价下跌了5%。
3. 3. The economy isexpected to drop in the coming years.
   预计未来几年经济将下滑。