“下跌”的意思是价格或数字往下降，常常用在钱、股票或市场上。

"下跌" means that prices or numbers go down, often used for money, stocks, or markets.

如果东西越来越便宜，我们就可以说价格在下跌。

If something becomes cheaper and cheaper, we can say the price is 下跌.