"Cover up a hole" 和 "Fill a hole" 的差別在哪裡？如果不好說明，請提供一些例句。

Covering up a hole doesn't get rid of the hole. The hole is still there. Like putting a lid on a cup. Filling a hole effectively gets rid of the hole - there's no longer a hole because it's gone. So, if you have a hole in the ground and fill it with dirt, it's no longer a hole and just dirt.

Some examples off the top of my head:
"He covered the hole with leaves so that his enemies would fall into it."
"He filled the hole where the well used to be so children wouldn't accidentally fall into it".

I hope that helps!