"He was expelled from the university for not studying well enough." この表現は自然ですか？

@rdt09 Being expelled due to "not studying well enough" or "studying badly" does not make much sense in American English. It's a very strange way to say what you're trying to say.

Studying is what you do when you are trying to learn. You go to the library to study, to read books, to try and gain more knowledge. There are many different ways you can study, or try to learn something.

Learning is when you understand what you are studying, and when you are able to fully comprehend what you are trying to learn. You have gained the knowledge from studying, you understand the subject.

You could get expelled for getting poor grades/marks in University. There is a huge difference between being expelled for "not studying well enough" or "studying badly" and getting poor grades.

I feel like you're going to fight me on this one, and disagree with me. If you want to say someone was kicked out of school because they studied badly, that's fine, it'll just sound really strange to any American you speak to. They will probably understand you, but it will sound very odd.