pennies from heaven和the penny drops有何分別？

(1) pennies from heaven即unexpected or incidental benefits, especially money，指「意外的好處」（尤指金錢），例如：

We need more money but we can't rely on pennies from heaven. We'll just have to work harder.

我們需要更多的錢，但不能坐等意外之財，而需更加勤力工作。

(2) the penny drops即understand something that was unnoticed or puzzling before，指「弄清不明白之事」，例如：

There was a long silence at the meeting, and then the penny finally dropped-I was supposed to be speaking.

會場沉默良久，之後我終於明白，我應該發言了。