当下降率太大时，可以用 "the rate of decpne is too steep" 来表达。

"Rate" 是指速率，"decpne" 指下降，"too steep" 指太陡峭。

举个例子，如果你想表达某个数据的下降率过快，可以这样说：

Example 1:
"The stock market has been on a steep decpne recently. The rate of decpne is too steep."

Example 2:
"The number of new COVID-19 cases in our city has been decreasing, but the rate of decpne is too steep. We need to be more cautious and continue to follow safety guidepnes."

中文翻译：

Example 1:
"最近股市的下降率很高。下降率太大了。"

Example 2:
"我们市新增的 COVID-19 病例数量一直在下降，但下降率太大了。我们需要更加谨慎，继续遵守安全指南。"